Brake Problem Please Help

[Toyota84]

I have a 1984 toyota pickup. When i first got it. It barely had any brakes. You had to pump them 2 to 3 times to get brakes. So i replaced the master cylinder. Which made it even worse. So maybe its the brake booster. 1 brake booster later still the same problem. Excpet now i have to pump the brakes 4 to 5 times to get anything. Then when i rev the motor all brakes are lost. Ive checked all the vacuum lines. Brakes lines. Nothings leaking at all. I have aboslutely no clue as to what needs to be done next. Theres solid fluid out of every bleeder even the LSPV. Its got the 22r motor in it. If youbgusy could please point me in the right direction that would be much appreciated.

 

[pappy]

Check your wheel bearings in the front. They might be loose and not torque to spec.

 

[Mudder]

Did you bleed the master cylinder before installing? Aka Bench bleed?

 

[KLF]

Are the rear brakes properly adjusted? Do you use the e-brake?

 

[Toyota84]

Ebrake doesnt work. I bench bleed the mc 2 times. And how could the wheel bearing have anything to do with the brakes?

 

[KLF]

Loose wheel bearings in the front will allow the rotor(s) to "wobble" with excessive runout, this will push the pistons back into the calipers after you take your foot off the brake. Then you have to double-pump the brakes next time you use them to get the pistons back extended so the pads can reach the rotor.

Same with rear brakes that are too loose, you would need to double-pump them if the adjusters are not extended enough. Using your e-brake regularly keeps the rear brakes properly adjusted, so I highly suggest you get that fixed. I assume the bellcranks are rusted in the pivots, this is a very common problem.

There is a check valve on the big vacuum line that goes to the brake booster, make sure it's working.

 

[Toyota84]

Im not driving the truck. Everything ive done has been sittin in my driveway. I can drive down my driveway without brakes. Ita downhill and goes into a very busy road.

 

[KLF]

Well the rear brakes will be a problem even if you aren't moving. I would pull the rear wheels, then pop out the little plugs in the backing plates. Spin the star wheels inside until you just start to feel drag when you spin the drums.