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Re: 05 Tundra with rear brake noise
Ken Shelton sez:
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> cuz [email]Dad-x-2@webtv.net[/email] sez:[/color]
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>> I have a 05 DC with 19k miles and ever since the truck has had around 8k
>> miles the rear brakes emit a loud moaning sound when you go to stop and
>> get down to about 4 mph or slower. Two dealers have checked and cleaned
>> the dust off and one replaced rear drums and they still do it badly. It
>> is loud enough that other drivers will turn and look at you. Would some
>> different shoes help this like high performance. Had them checked again
>> yesterday and was told they still looked great and the noise was normal.
>> BS, I have never owned a vehicle that made that much brake noise.
>> Suggestions?
>>[/color]
> Well, it certainly isn't normal. Keep taking it back to the dealership
> and demanding action. If necessary, contact the district rep. Maybe
> Toyota changed the compound of the brake shoe lining, or maybe they
> changed suppliers...in any case, they need to make it right.[/color]
Yesterday, I pulled the rear drums off, blew the dust of and cleaned
everything up so I could have a good look at things. The only abnormal
condition I found (in both drums) is "banding" in the very center of the
friction surface contact/wear area showing uneven pressure exerted by
the brake shoes. (I have pictures I can email if you want to see them).
I laid a straightedge on the shoes themselves with a bright flashlight
on the back side and this showed the contact surface of the shoe to be
"dished" with light coming from the other side in the middle and
decreasing out to the sides.
This leads me to believe that the steel backing plates of the shoes
themselves aren't thick enough nor sufficiently reinforced from the
center rib out to keep the outside of the shoes from deflecting under
load. This causes the center of the shoes to wear more quickly than the
outsides. Once worn and under light braking pressure, only the outsides
of the shoes are in contact with the drum instead of the full shoe and
this results in the vibration or "moan" on braking.
I bet replacement of the brake shoes (and turning of the drums too)
would make it immediately go away. I'll find out how enthusiastic my
local dealer will be to take such measures.
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> I do not like the idea of air bags or any other helper springs in the
> back. The rear brake proportioning valve allows more braking effort
> from the rears when more load gives the rear tires more traction. The
> proportioning valve senses the load on the rear by the height of the bed
> above the axle. Helper springs of any type raise the bed under load and
> do not allow the rears to provide as much braking as they should.[/color]
That's true, but the beauty of air bags is that you can adjust the
pressure in them. I installed them since I'll be using a slide-in
camper that when fully provisioned will be right at the vehicle's
maximum payload capacity. Once you turn off the road to go many more
miles back in to camp, being able to pressure up and get more clearance
and suspension travel is a good thing. Once back on the pavement, the
pressure can be bled off to have all of the aforementioned benefits of
more braking in the rear.
Good wrenchin' & off-roadin' to ya,
VLJ
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