brake troubles - Toyota Nation Forum : Toyota Car and Truck Forums

jd450 · 02-15-2009, 08:51 PM

well, i having some trouble w/ my '93 T100. i did a quick search but didnt find anything.

whats happening is my brake pedal is going all the way to the floor and there is basically NO pressure. the truck stops, but not until the pedal has gone down to the floor. me and a friend bled the brakes hoping the old gunky fluid was the culpret but apperantly not. im still having the same problem....but w/ all new brake fluid

.

any ideas, guys? any advice is greatly appreciated.

BamZipPow · 02-15-2009, 08:53 PM

Did you bleed the LSPV? I'd disconnect it from the rear axle and tie it up before you bleed out the rears and the LSPV...then reconnect it back to the axle.

jd450 · 02-15-2009, 09:06 PM

Bam, thanks for the speedy reply.

we didnt disconnect/tie up the LSPV. we did infact bleed it 1st before moving to the right rear, then left rear, and so on ending at the front left. we bled hte LSPV until new fluid was flowing through before moving on to the right rear wheel.

BamZipPow · 02-15-2009, 09:29 PM

Did you find that the fluid was kinda slow going through? When the LSPV is tied up so it see a "max" load it really lets the fluid go through there to the rear brakes. I didn't find my problem until I locked up my brakes the rears didn't do a thing.

It should be the left rear first...then right rear...then LSPV but I did my LSPV first because it didn't allow the fluid to git to the rear brakes. Yes...I had replaced my master cylinder first thinking that was the problem but after running it through my head...the LSPV became my focus.

I had to beat on it with a 2x4 to break any crap that was built up in there free and I got a lot of air out of there first...then the left rear got a lot of air out and the right rear was pretty much fluid. After doing the fronts, the pedal was fantastic!!

The test I did was block the front wheels then jack up the rears by the differential. Spun the tires and stepped on the brakes. My wheels were still spinning!!

After attacking the LSPV and bleeding it out, the rears stopped like they were supposed to...

BamZipPow · 02-15-2009, 10:13 PM

Fergot to ask...

Is there any fluid leaks around the master cylinder near the booster? That's usually a tell tale sign that the seals on the master is bad. I believe there's a weep hole there that allows it drip down if the seals aren't holding up.

Can you pump it up at all?

Did you allow the fluid level in the reservoir to git too low?

Are the rear brakes adjusted properly? When you pull the emergency brake lever it should click between 11-17 times before it locks the brakes up. If not, then you need to cycle the emergency brakes a few times to git it to adjust or if yer brave and smart enough you can do it manually at the back of the rear backing plates.

Do you have the anti lock brake system? If so...is yer power steering pump working and not leaking? The fluid in there runs the ABS actuator...

93T100Cook · 04-07-2009, 10:24 AM

THIS IS EXACTLY WHAT I'M GOING THROUGH

I'm gonna work on it tonight and see what happens. Thanks for this post, and as usuall, thanks BAM

93T100Cook · 04-07-2009, 10:27 AM

I'm also betting my e-brake is frozen as well...

I might get out of a brake job yet!

93T100Cook · 04-07-2009, 12:24 PM

Did the advice in this thread help out at all? I'm experienceing the same issued and will be going through the steps above. If you have anything to add please shout out! I need all the help I can get

Cook

BamZipPow · 04-07-2009, 12:58 PM

Are you able to confirm whether or not yer e-brake is frozen or not? You should be able to tell on the bellcrank that goes into the backplate when you release the brake.

Did you ever jack up the rear end with both tires off the ground and see if they would spin or not?

93T100Cook · 04-07-2009, 01:18 PM

I'll be looking at all that tonight Bam. I'll let you know something this late tonight. Just to confirm, when you say "release the break," are you talking about the parking break and I'm also assuming to put the trans in neutral (5sp).

Also planning on taking pics to get you opinion on the drums.

93T100Cook · 04-07-2009, 01:22 PM

Also, I'm assuming if the wheels spin, then they are not frozen? Obvious question, but want to make sure

BamZipPow · 04-07-2009, 01:24 PM

Well...since you have an open differential...putting the truck in neutral shouldn't make a difference. The tires should rotate opposite of each other when they are spun by hand.

Make sure you block the front wheels really well...hate to see yer truck take off running down the block or something.

When the tires are spinning...step on the brakes and see if they stop or not...

93T100Cook · 04-07-2009, 02:01 PM

Will do

93T100Cook · 04-07-2009, 04:52 PM

Bam,
Last question for the night. When you say bleed the "left rear" first, is the "left" as if I'm facing the motor? Just need to make sure and i'll let ya know how it goes.

93T100Cook · 04-07-2009, 07:09 PM

Quote:

Originally Posted by BamZipPow

Well...since you have an open differential...putting the truck in neutral shouldn't make a difference. The tires should rotate opposite of each other when they are spun by hand.

Make sure you block the front wheels really well...hate to see yer truck take off running down the block or something.

When the tires are spinning...step on the brakes and see if they stop or not...

Bam,

Tires spun, but did not stop when brakes were applied.