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Old 03-05-2005, 04:57 PM   #1 (permalink)
Steve Henderson
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Break pads & disks replacement - 2002 Avalon XLS

Over the years, I've replaced lots-o-brakes on various cars with disks.
However, the Avalon is the fist car I've ever had with ABS breaks. Is
there more involved with these ABS brakes than regular disk breaks when
it comes time to replace the pads and disks, or should I just dive right
in? I'm just used to taking the top pin out of the calipers and swinging
them down to reaplace the pads, etc.

Thanks,
Steve
 
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Old 03-05-2005, 07:23 PM   #2 (permalink)
Charles Pisano
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Re: Break pads & disks replacement - 2002 Avalon XLS

Just don't 'break' the pads.


 
Old 03-05-2005, 10:46 PM   #3 (permalink)
Ray O
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Steve Henderson" <shenderson_2@charter.net> wrote in message
news:5QqWd.8616$8A5.600@fe04.lga...[color=blue]
> Over the years, I've replaced lots-o-brakes on various cars with disks.
> However, the Avalon is the fist car I've ever had with ABS breaks. Is
> there more involved with these ABS brakes than regular disk breaks when it
> comes time to replace the pads and disks, or should I just dive right in?
> I'm just used to taking the top pin out of the calipers and swinging them
> down to reaplace the pads, etc.
>
> Thanks,
> Steve[/color]

There is no difference in changing pads and rotors in a car with or without
ABS.
--
Ray O
correct the return address punctuation to reply


 
Old 03-06-2005, 01:35 PM   #4 (permalink)
Viperkiller
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Re: Break pads & disks replacement - 2002 Avalon XLS

On Sat, 05 Mar 2005 16:57:20 -0600, Steve Henderson
<shenderson_2@charter.net> wrote:
[color=blue]
>Over the years, I've replaced lots-o-brakes on various cars with disks.
>However, the Avalon is the fist car I've ever had with ABS breaks. Is
>there more involved with these ABS brakes than regular disk breaks when
>it comes time to replace the pads and disks, or should I just dive right
>in? I'm just used to taking the top pin out of the calipers and swinging
>them down to reaplace the pads, etc.
>
>Thanks,
>Steve[/color]

Steve,

As others have already replied that there isn't any difference, I
won't repeat it.

One thing you may need to know about the newer designs is the way the
pads are taken out. I'm not sure if you Avalon falls in this category
but some of the newer cars are designed now where you don't even have
to take the caliper bolts off to replace the pads. You can merely
slide them through the opening on top of the calipers. They can have
rods that slide through the calipers that hold the pads in place.
Obviously removing those rods will allow access to the pads.
 
Old 03-06-2005, 10:28 PM   #5 (permalink)
Steve Henderson
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Re: Break pads & disks replacement - 2002 Avalon XLS

Viperkiller wrote:[color=blue]
> On Sat, 05 Mar 2005 16:57:20 -0600, Steve Henderson
> <shenderson_2@charter.net> wrote:
>
>[color=green]
>>Over the years, I've replaced lots-o-brakes on various cars with disks.
>>However, the Avalon is the fist car I've ever had with ABS breaks. Is
>>there more involved with these ABS brakes than regular disk breaks when
>>it comes time to replace the pads and disks, or should I just dive right
>>in? I'm just used to taking the top pin out of the calipers and swinging
>>them down to reaplace the pads, etc.
>>
>>Thanks,
>>Steve[/color]
>
>
> Steve,
>
> As others have already replied that there isn't any difference, I
> won't repeat it.
>
> One thing you may need to know about the newer designs is the way the
> pads are taken out. I'm not sure if you Avalon falls in this category
> but some of the newer cars are designed now where you don't even have
> to take the caliper bolts off to replace the pads. You can merely
> slide them through the opening on top of the calipers. They can have
> rods that slide through the calipers that hold the pads in place.
> Obviously removing those rods will allow access to the pads.[/color]

Thanks to everyone who responded. Think I'll tackle it since I've been
down the general road before with good (read less expensive) results.

Steve
 
Old 03-06-2005, 11:37 PM   #6 (permalink)
Ray O
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Re: Break pads & disks replacement - 2002 Avalon XLS


"mrcheerful ." <nbkm57@hotmail.com> wrote in message
news:e3zWd.29404$8B3.1705@text.news.blueyonder.co.uk...[color=blue]
>
> "Ray O" <rokigawa@tristarassociatesDOTcom> wrote in message
> news:63a00$422a8b46$180fead6$24231@msgid.meganewsservers.com...[color=green]
>>
>> "Steve Henderson" <shenderson_2@charter.net> wrote in message
>> news:5QqWd.8616$8A5.600@fe04.lga...[color=darkred]
>>> Over the years, I've replaced lots-o-brakes on various cars with disks.
>>> However, the Avalon is the fist car I've ever had with ABS breaks. Is
>>> there more involved with these ABS brakes than regular disk breaks when
>>> it comes time to replace the pads and disks, or should I just dive right
>>> in? I'm just used to taking the top pin out of the calipers and swinging
>>> them down to reaplace the pads, etc.
>>>
>>> Thanks,
>>> Steve[/color]
>>
>> There is no difference in changing pads and rotors in a car with or
>> without ABS.[/color]
>
> just don't damage the sensors, cleaning the sensor and sender ring is a
> good idea if you can see it, avoid hammering the disc off and careful if
> you use heat. otherwise they are the same setup exactly, I have now got in
> the habit of letting the fluid out of the caliper rather than pushing it
> back into the system as a matter of good practice rather than any specific
> abs related need.
>
> mrcheerful[/color]
Toyota doesn't use a "sender ring" on their ABS systems. The hub inboard of
the rotor and backing plate is notched an looks like a gear. The sensor
measures hub RPM by sensing the presence or absence of the teeth on the hub
and the computer counts how many on-off cycles occur in a given time and
computes wheel speed. There is no need to clean the sensor or hub.
--
Ray O
correct the return address punctuation to reply


 
Old 03-07-2005, 02:25 PM   #7 (permalink)
Jeff Strickland
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Re: Break pads & disks replacement - 2002 Avalon XLS

It's BRAKES, not breaks.

No, the ABS should not change the method of replacing pads or rotors. ABS
can play a role in bleeding the brakes, but yous hsould be able to replace
pads and rotors without getting into the brake bleeding procedure.



"Steve Henderson" <shenderson_2@charter.net> wrote in message
news:5QqWd.8616$8A5.600@fe04.lga...[color=blue]
> Over the years, I've replaced lots-o-brakes on various cars with disks.
> However, the Avalon is the fist car I've ever had with ABS breaks. Is
> there more involved with these ABS brakes than regular disk breaks when
> it comes time to replace the pads and disks, or should I just dive right
> in? I'm just used to taking the top pin out of the calipers and swinging
> them down to reaplace the pads, etc.
>
> Thanks,
> Steve[/color]


 
Old 03-07-2005, 08:51 PM   #8 (permalink)
Steve Henderson
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Re: Break pads & disks replacement - 2002 Avalon XLS

Jeff Strickland wrote:
It's BRAKES, not breaks.

No, the ABS should not change the method of replacing pads or rotors.
ABS can play a role in bleeding the brakes, but yous hsould be able to
replace pads and rotors without getting into the brake bleeding procedure.


"Steve Henderson" wrote in message
news:5QqWd.8616$8A5.600@fe04.lga...
[color=blue][color=green]
>> Over the years, I've replaced lots-o-brakes on various cars with[/color][/color]
disks. However, the Avalon is the "fist" car I've ever had with ABS
breaks. Is there more involved with these ABS brakes than regular disk
breaks when it comes time to replace the pads and disks, or should I
just dive right in? I'm just used to taking the top pin out of the
calipers and swinging them down to reaplace the pads, etc.

Thanks,
Steve
<<

Thanks for the correction on two of my many typos... You'll notice that
I typed it correctly there in the middle. I also have trouble with
"group" - when I type fast, it always comes out "gruop".

(By the way, it's "you should", not "yous hsould").

<grin - sorry - just couldn't resist>.

St3ve
 
Old 03-08-2005, 05:22 PM   #9 (permalink)
Jeff Strickland
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Re: Break pads & disks replacement - 2002 Avalon XLS

[color=blue]
> Thanks for the correction on two of my many typos... You'll notice that
> I typed it correctly there in the middle. I also have trouble with
> "group" - when I type fast, it always comes out "gruop".
>
> (By the way, it's "you should", not "yous hsould").
>[/color]

I just caught that too. Fingers moving faster than the brain ...




 
Old 03-09-2005, 01:46 PM   #10 (permalink)
Ray O
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:uuadnQsOc-orJbHfRVn-1A@ez2.net...[color=blue]
> It's BRAKES, not breaks.
>
> No, the ABS should not change the method of replacing pads or rotors. ABS
> can play a role in bleeding the brakes, but yous hsould be able to replace
> pads and rotors without getting into the brake bleeding procedure.
>[/color]

ABS does not have any role in bleeding the brake lines in an Avalon or any
other Toyota sold in the U.S. I have never seen a vehicle where the
procedure for bleeding brake lines was different in a vehicle with ABS.
--
Ray O
correct the return address punctuation to reply


 
Old 03-09-2005, 04:05 PM   #11 (permalink)
Jeff Strickland
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
news:4eb58$422f55f9$44a4a10d$18317@msgid.meganewsservers.com...[color=blue]
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:uuadnQsOc-orJbHfRVn-1A@ez2.net...[color=green]
> > It's BRAKES, not breaks.
> >
> > No, the ABS should not change the method of replacing pads or rotors.[/color][/color]
ABS[color=blue][color=green]
> > can play a role in bleeding the brakes, but yous hsould be able to[/color][/color]
replace[color=blue][color=green]
> > pads and rotors without getting into the brake bleeding procedure.
> >[/color]
>
> ABS does not have any role in bleeding the brake lines in an Avalon or any
> other Toyota sold in the U.S. I have never seen a vehicle where the
> procedure for bleeding brake lines was different in a vehicle with ABS.[/color]


I suspect you are right, but if there was any issue with brakes that
involved the ABS, it would be in bleeding the system, not in replacing pads
or rotors. I didn't want to say that ABS presented no new considerations
because I just can't be sure that a statement to that effect would be
accurate. It is better to suggest that the ABS might come into play in
bleeding than to suggest that ABS could be completely ignored.




 
Old 03-09-2005, 05:12 PM   #12 (permalink)
Ray O
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:9MadnV-qqLqj7rLfRVn-hQ@ez2.net...[color=blue]
>
> "Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
> news:4eb58$422f55f9$44a4a10d$18317@msgid.meganewsservers.com...[color=green]
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:uuadnQsOc-orJbHfRVn-1A@ez2.net...[color=darkred]
>> > It's BRAKES, not breaks.
>> >
>> > No, the ABS should not change the method of replacing pads or rotors.[/color][/color]
> ABS[color=green][color=darkred]
>> > can play a role in bleeding the brakes, but yous hsould be able to[/color][/color]
> replace[color=green][color=darkred]
>> > pads and rotors without getting into the brake bleeding procedure.
>> >[/color]
>>
>> ABS does not have any role in bleeding the brake lines in an Avalon or
>> any
>> other Toyota sold in the U.S. I have never seen a vehicle where the
>> procedure for bleeding brake lines was different in a vehicle with ABS.[/color]
>
>
> I suspect you are right,[/color]

I know I am right. (don't tell my wife, she automatically assumes that what
I say in incorrect)

but if there was any issue with brakes that[color=blue]
> involved the ABS, it would be in bleeding the system, not in replacing
> pads
> or rotors.[/color]

If there is an issue with brakes that involved ABS, it would NOT be in
bleeding the system, and it would not be in replacing pads or rotors.

I didn't want to say that ABS presented no new considerations[color=blue]
> because I just can't be sure that a statement to that effect would be
> accurate.
>[/color]
Before you make wild speculation or recommendations to someone, I would
strongly suggest that you study the subject first.

ABS stands for anti-lock brakes. An ABS system is designed to prevent wheel
lockup and try to equalize the rotational speed of the wheels. If one or
more wheels is turning more slowly than the other wheels, an ABS system will
reduce the brake force on the wheels that are turning more slowly. Every
ABS system I have ever seen uses a computer to keep track of vehicle and
wheel speed and an actuator which modulates the braking force. ABS systems
are a supplement to the vehicle's basic braking system, not a replacement.
Contrary to urban legend and uninformed beliefs, a faulty ABS system will
not make the car spin around like the girl's head in the exorcist, it will
not lock the wheels up, it will not apply the brakes in the path of an
onrushing train at a railroad crossing, or toss your mother-in-law through
the windshield when braking. If a component of the ABS system fails, then
you are left with a vehicle with a conventional braking system that is
absolutely no different in braking characteristics from an identical vehicle
without ABS.

There are 3 basic components to an ABS system. The electronic control unit,
known as an ECU; an actuator, which controls the brake fluid going to each
wheel (or axle in more basic ABS systems), and the sensors which measure
wheel hub speed. On a vehicle with ABS, the hub has notches that look like
gear teeth machined, and as the hub rotates, the notches pass by the ABS
sensor. The faster the notches go by the sensor, the faster the sensor
sends the on-off signal to the computer. The ECU counts how many times the
sensor gives an on-off signal in a given amount of time and calculates hub
speed, by which it knows wheel speed. The wheel speed for each corner is
compared, and if a wheel is turning more slowly than the others, wheel
lockup is implied so the actuator releases the pressure on the offending
wheel to let it catch up with the others.

One bleeds brakes to get air out of the brake lines. Because air will
compress and fluid will not compress, air in brake lines causes a spongy
pedal and reduced force on the caliper or wheel cylinder pistons, resulting
in reduced braking effectiveness. Bleeding the brakes has absolutely no
connection with ABS.

One changes brake rotors or drums if they are excessively worn or so out of
true that they cannot be machined to a true condition. One changes brake
pads or shoes if they are worn. Again, pads, rotors, shoes, and drums have
no connection with ABS.
[color=blue]
> It is better to suggest that the ABS might come into play in[/color]
bleeding than to suggest that ABS could be completely ignored.

It is even better yet to have some knowledge of a subject before giving
advice or speculation or wild guesses that is not even remotely close to
being correct.
--
Ray O
correct the return address punctuation to reply


 
Old 03-10-2005, 03:47 PM   #13 (permalink)
Jeff Strickland
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
news:8eca3$422f879f$44a4a10d$892@msgid.meganewsservers.com...[color=blue]
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:9MadnV-qqLqj7rLfRVn-hQ@ez2.net...[color=green]
> >
> > "Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
> > news:4eb58$422f55f9$44a4a10d$18317@msgid.meganewsservers.com...[color=darkred]
> >>
> >> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> >> news:uuadnQsOc-orJbHfRVn-1A@ez2.net...
> >> > It's BRAKES, not breaks.
> >> >
> >> > No, the ABS should not change the method of replacing pads or rotors.[/color]
> > ABS[color=darkred]
> >> > can play a role in bleeding the brakes, but yous hsould be able to[/color]
> > replace[color=darkred]
> >> > pads and rotors without getting into the brake bleeding procedure.
> >> >
> >>
> >> ABS does not have any role in bleeding the brake lines in an Avalon or
> >> any
> >> other Toyota sold in the U.S. I have never seen a vehicle where the
> >> procedure for bleeding brake lines was different in a vehicle with ABS.[/color]
> >
> >
> > I suspect you are right,[/color]
>
> I know I am right. (don't tell my wife, she automatically assumes that[/color]
what[color=blue]
> I say in incorrect)
>
> but if there was any issue with brakes that[color=green]
> > involved the ABS, it would be in bleeding the system, not in replacing
> > pads
> > or rotors.[/color]
>
> If there is an issue with brakes that involved ABS, it would NOT be in
> bleeding the system, and it would not be in replacing pads or rotors.
>[/color]

I said that backwards. If there is an issue with bleeding the brakes, it
would involve the ABS. But, replacing pads and rotors will not cause a need
to bleed brakes. And, if air was introduced at the calipers, then the
bleeding would not involve the ABS.



[color=blue]
> I didn't want to say that ABS presented no new considerations[color=green]
> > because I just can't be sure that a statement to that effect would be
> > accurate.
> >[/color]
> Before you make wild speculation or recommendations to someone, I would
> strongly suggest that you study the subject first.
>[/color]
I made no wild speculation.

The question was if replacing brake components was different because ABS was
involved. The answer to that question is, No.

As a matter of providing more information than was really needed, I
suggested that ABS _might_ play a role in bleeding the brakes. I know that
in at least one of my cars, the Factory Service Manual says that ABS will
present issues in bleeding the brake system. This manual is not for a Toyota
product, but it is worth mentioning that the only impact of ABS on brake
service will come in bleeding the system.


[color=blue]
> ABS stands for anti-lock brakes. An ABS system is designed to prevent[/color]
wheel[color=blue]
> lockup and try to equalize the rotational speed of the wheels. If one or
> more wheels is turning more slowly than the other wheels, an ABS system[/color]
will[color=blue]
> reduce the brake force on the wheels that are turning more slowly. Every
> ABS system I have ever seen uses a computer to keep track of vehicle and
> wheel speed and an actuator which modulates the braking force. ABS[/color]
systems[color=blue]
> are a supplement to the vehicle's basic braking system, not a replacement.
> Contrary to urban legend and uninformed beliefs, a faulty ABS system will
> not make the car spin around like the girl's head in the exorcist, it will
> not lock the wheels up, it will not apply the brakes in the path of an
> onrushing train at a railroad crossing, or toss your mother-in-law through
> the windshield when braking. If a component of the ABS system fails, then
> you are left with a vehicle with a conventional braking system that is
> absolutely no different in braking characteristics from an identical[/color]
vehicle[color=blue]
> without ABS.
>[/color]

All of this is all well and good, but when bleeding an ABS valve body, one
wants to make absolutely certain that they do not introduce air into the
system that can become trapped in the valve body and cause the braking
system to not function properly.


[color=blue]
> There are 3 basic components to an ABS system. The electronic control[/color]
unit,[color=blue]
> known as an ECU; an actuator, which controls the brake fluid going to each
> wheel (or axle in more basic ABS systems), and the sensors which measure
> wheel hub speed. On a vehicle with ABS, the hub has notches that look[/color]
like[color=blue]
> gear teeth machined, and as the hub rotates, the notches pass by the ABS
> sensor. The faster the notches go by the sensor, the faster the sensor
> sends the on-off signal to the computer. The ECU counts how many times[/color]
the[color=blue]
> sensor gives an on-off signal in a given amount of time and calculates hub
> speed, by which it knows wheel speed. The wheel speed for each corner is
> compared, and if a wheel is turning more slowly than the others, wheel
> lockup is implied so the actuator releases the pressure on the offending
> wheel to let it catch up with the others.
>
> One bleeds brakes to get air out of the brake lines. Because air will
> compress and fluid will not compress, air in brake lines causes a spongy
> pedal and reduced force on the caliper or wheel cylinder pistons,[/color]
resulting[color=blue]
> in reduced braking effectiveness. Bleeding the brakes has absolutely no
> connection with ABS.
>[/color]

This is true to a point, the ABS valve body (you referred to it as
"actuator", I have seen several different names and I like valve body
because that is essentially what it is) can be a place where air can be
trapped. If one can manage to keep air out of the system, then the valve
body is of no concern, and then you are absolutely right. But, if one
manages to slip and allow air to get into the system, then the valve body -
the ABS system - becomes a huge issue; and that is my only point.


[color=blue]
> One changes brake rotors or drums if they are excessively worn or so out[/color]
of[color=blue]
> true that they cannot be machined to a true condition. One changes brake
> pads or shoes if they are worn. Again, pads, rotors, shoes, and drums[/color]
have[color=blue]
> no connection with ABS.
>[color=green]
> > It is better to suggest that the ABS might come into play in[/color]
> bleeding than to suggest that ABS could be completely ignored.
>
> It is even better yet to have some knowledge of a subject before giving
> advice or speculation or wild guesses that is not even remotely close to
> being correct.[/color]

I know exactly how ABS works. And when bleeding a car with ABS, many service
manuals tell you that the ABS will affect the bleeding of the system because
ABS has critical needs relative to fluid bleeding.

It is completely true that one can replace pads and rotors without any
consideration of ABS.


 
Old 03-10-2005, 03:51 PM   #14 (permalink)
Jeff Strickland
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Re: Break pads & disks replacement - 2002 Avalon XLS

Here is my original post, by the way.

<quote>
It's BRAKES, not breaks.

No, the ABS should not change the method of replacing pads or rotors. ABS
can play a role in bleeding the brakes, but yous hsould be able to replace
pads and rotors without getting into the brake bleeding procedure.

</quote>


As you can see, all I said was that ABS *can* play a role in bleeding the
brakes, but it is painfully clear that I told the OP that he can replace the
pads and rotors, and I have to wonder why you are jumping in my shit and
kicking so fierciously.





"Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
news:8eca3$422f879f$44a4a10d$892@msgid.meganewsservers.com...[color=blue]
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:9MadnV-qqLqj7rLfRVn-hQ@ez2.net...[color=green]
> >
> > "Ray O" <rokigawa@tristarassociatesDOT.com> wrote in message
> > news:4eb58$422f55f9$44a4a10d$18317@msgid.meganewsservers.com...[color=darkred]
> >>
> >> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> >> news:uuadnQsOc-orJbHfRVn-1A@ez2.net...
> >> > It's BRAKES, not breaks.
> >> >
> >> > No, the ABS should not change the method of replacing pads or rotors.[/color]
> > ABS[color=darkred]
> >> > can play a role in bleeding the brakes, but yous hsould be able to[/color]
> > replace[color=darkred]
> >> > pads and rotors without getting into the brake bleeding procedure.
> >> >
> >>
> >> ABS does not have any role in bleeding the brake lines in an Avalon or
> >> any
> >> other Toyota sold in the U.S. I have never seen a vehicle where the
> >> procedure for bleeding brake lines was different in a vehicle with ABS.[/color]
> >
> >
> > I suspect you are right,[/color]
>
> I know I am right. (don't tell my wife, she automatically assumes that[/color]
what[color=blue]
> I say in incorrect)
>
> but if there was any issue with brakes that[color=green]
> > involved the ABS, it would be in bleeding the system, not in replacing
> > pads
> > or rotors.[/color]
>
> If there is an issue with brakes that involved ABS, it would NOT be in
> bleeding the system, and it would not be in replacing pads or rotors.
>
> I didn't want to say that ABS presented no new considerations[color=green]
> > because I just can't be sure that a statement to that effect would be
> > accurate.
> >[/color]
> Before you make wild speculation or recommendations to someone, I would
> strongly suggest that you study the subject first.
>
> ABS stands for anti-lock brakes. An ABS system is designed to prevent[/color]
wheel[color=blue]
> lockup and try to equalize the rotational speed of the wheels. If one or
> more wheels is turning more slowly than the other wheels, an ABS system[/color]
will[color=blue]
> reduce the brake force on the wheels that are turning more slowly. Every
> ABS system I have ever seen uses a computer to keep track of vehicle and
> wheel speed and an actuator which modulates the braking force. ABS[/color]
systems[color=blue]
> are a supplement to the vehicle's basic braking system, not a replacement.
> Contrary to urban legend and uninformed beliefs, a faulty ABS system will
> not make the car spin around like the girl's head in the exorcist, it will
> not lock the wheels up, it will not apply the brakes in the path of an
> onrushing train at a railroad crossing, or toss your mother-in-law through
> the windshield when braking. If a component of the ABS system fails, then
> you are left with a vehicle with a conventional braking system that is
> absolutely no different in braking characteristics from an identical[/color]
vehicle[color=blue]
> without ABS.
>
> There are 3 basic components to an ABS system. The electronic control[/color]
unit,[color=blue]
> known as an ECU; an actuator, which controls the brake fluid going to each
> wheel (or axle in more basic ABS systems), and the sensors which measure
> wheel hub speed. On a vehicle with ABS, the hub has notches that look[/color]
like[color=blue]
> gear teeth machined, and as the hub rotates, the notches pass by the ABS
> sensor. The faster the notches go by the sensor, the faster the sensor
> sends the on-off signal to the computer. The ECU counts how many times[/color]
the[color=blue]
> sensor gives an on-off signal in a given amount of time and calculates hub
> speed, by which it knows wheel speed. The wheel speed for each corner is
> compared, and if a wheel is turning more slowly than the others, wheel
> lockup is implied so the actuator releases the pressure on the offending
> wheel to let it catch up with the others.
>
> One bleeds brakes to get air out of the brake lines. Because air will
> compress and fluid will not compress, air in brake lines causes a spongy
> pedal and reduced force on the caliper or wheel cylinder pistons,[/color]
resulting[color=blue]
> in reduced braking effectiveness. Bleeding the brakes has absolutely no
> connection with ABS.
>
> One changes brake rotors or drums if they are excessively worn or so out[/color]
of[color=blue]
> true that they cannot be machined to a true condition. One changes brake
> pads or shoes if they are worn. Again, pads, rotors, shoes, and drums[/color]
have[color=blue]
> no connection with ABS.
>[color=green]
> > It is better to suggest that the ABS might come into play in[/color]
> bleeding than to suggest that ABS could be completely ignored.
>
> It is even better yet to have some knowledge of a subject before giving
> advice or speculation or wild guesses that is not even remotely close to
> being correct.
> --
> Ray O
> correct the return address punctuation to reply
>
>[/color]


 
Old 03-10-2005, 05:02 PM   #15 (permalink)
Ray O
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Re: Break pads & disks replacement - 2002 Avalon XLS


"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:-KidnaHOUKg7XK3fRVn-2g@ez2.net...[color=blue]
> Here is my original post, by the way.
>
> <quote>
> It's BRAKES, not breaks.
>
> No, the ABS should not change the method of replacing pads or rotors. ABS
> can play a role in bleeding the brakes, but yous hsould be able to replace
> pads and rotors without getting into the brake bleeding procedure.
>
> </quote>
>
>
> As you can see, all I said was that ABS *can* play a role in bleeding the
> brakes, but it is painfully clear that I told the OP that he can replace
> the
> pads and rotors, and I have to wonder why you are jumping in my shit and
> kicking so fierciously.
>
>
>[/color]
Jeff,

Don't take this personally. I was not jumping on your shit, I was just
trying to clarify your advice, which, IMO, was a little confusing to the OP.

As you know, there is no need to bleed brake lines when changing pads and
rotors. When you mentioned bleeding brakes in your response, to me, it
looked like you were saying that ABS might but shouldn't have to play a role
in changing pads and rotors.

I thought your explanation was a little confusing so I wanted to clarify
that for just changing pads and rotors, whether a car does or does not have
ABS is not a consideration. Since you don't need to bleed brakes when
changing pads or rotors, ABS is still not a consideration.


--
Ray O
correct the return address punctuation to reply


 
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