Topic: need brake help

[84xcab]

Its been a while since i last logged on but at least looked every day since so I'm back. I need advice on what to do about the brakes on my 84' xtra cab 4x4 pickup. The front calipers and pads were replaced last weekend and brakes bled three times. The brake pedal went soft soon after each time the brakes were bled so I think air is somehow getting into the brake lines. Any ideas on that? Also the rear brakes lock up sometimes when i barely push the brake. Any help would be appreciated.

[4x4Haze]

check your master cylinder, and i had a similar problem with the brakes locking up it was the wheel cylinders in your drum brakes, they dont cost too much and if youve never changed them that might be the problem

[jimbo74]

did you bleed the lpsv? above the rear axle on the frame rail? if it is not bled, there will be problems

[84xcab [OP]]

Wheel cylinders have never been replaced so I'll give that a try and I forgot about the lpsv. thanks for the help

[RN37DD]

sounds to me like your front brakes aren't doing what they should.  find a safe area on some dirt road, at a slow speed stomp on the brakes and skid to a stop. get out and check that all your brakes are working. that should give you an idea whats not working. i drove a Chevy that had a bad master cylinder with no front brakes and the rear brakes would lock up all the time. 

[84xcab [OP]]

The rear brakes seemed fine after we replaced the front calipers but it started doing it a little bit again. Going to take a look at everything tomorrow though.

[DeadlyPeace]

Sound like it's an internal leak of the master cylinder.



BTW, I keep forgetting about that darn lpsv too. Just trying to remember where it came into the order of bleeding. It was after the two rears, right?

[84xcab [OP]]

Uhh i think it goes driver rear, passenger rear, passenger front, driver front, then last lspv.

[DeadlyPeace]

I was thinking it was somewhere in the middle of the order, but I could be wrong. I end up having to bleed them once every other year if that. This being the reason I keep forgetting about it.

Anybody else want to verify on this?

[OOPS]

I was thinking it was somewhere in the middle of the order, but I could be wrong. I end up having to bleed them once every other year if that. This being the reason I keep forgetting about it.

Anybody else want to verify on this?

Since it is hooked into the front and back systems and is the seconded highest componet in the system it is bled last.

Although they word it different in the FSM this is correct.

"Uhh i think it goes driver rear, passenger rear, passenger front, driver front, then last lspv."

The FSM says longest to shortest line then LSPV, that is what the above is.

[DeadlyPeace]

Good to know. Thanks for the verification.

[84pickup]

when i first got my 84 pickup 2 years ago the  rears were locking up really easily and so i discovered that some rust or something clogged up my wheel cylinders. called toyota and they wanted 50$. so i decided i would take a look and what a wheel cylinder was made of so i disembled it using my FSM and cleaned it out and put it back together. now my brakes are starting to lock up again though so i'll check around and see if it's that again or something else.

[b_ripper8]

You said you replaced your front calipers right? Check to make sure you didn't put them on the wrong sides. If they air, the bleeder valve will be too low and won't ever bleed all the air out. They can't be swapped side to side.

[84xcab [OP]]

Bled the brakes today using the order in FSM. They are much better now so it was probably the LSPV that probably hadn't been bled in over 20 years. As for the rears locking up I must have been imagining it because it doesn't happen now. Thanks for all the help.