Brianbajnuth

The brakes on my 87 trans am gta are weak. By weak I mean I have to push all the way to the floor for the car to stop, and still doesn't stop right away. Just bearly! Help!!!

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iTrader: (1)

How's the fluid level in your brake fluid reservoir?
Sounds to me like you've got a lot of air in your brake lines.
Do you have to apply a LOT of force to the pedal or does it go down quite easily?

Brianbajnuth

It goes down about 2 inches and then gets hard I believe it's the master cylinder

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iTrader: (1)

May still be air, which has to come from somewhere, so yes, the MC may have a defect. Only one way to rule that out: take it apart and look inside
Perhaps the seals have corroded.

Brianbajnuth

Thanks for the help really appreciate it

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iTrader: (1)

Sure. You're welcome. Keep us posted, please!

topj

i think i may be having this same problem not sure... i hear like a vacuum noise coming from the brake pedal area and i have to push the pedal down all the way and it wasnt like this before...can burn outs cause this?

antares57

iTrader: (8)

Bad brake booster if you hear hissing noise. Swapped mine out, now it's fine.

Brianbajnuth

It has all the symptoms of a bad brake booster but it holds vacuum so I ruled that out. Now the master is left. Can the master cause a hard pedal after about 2 inches. And the brakes are weak too can't lock the wheels. I ruled air in the lines out because if it had air in lines then the pedal would go to the floor. What can it be. Mind you that I took the proportioning valve out and put a Wilwood one on the rear brakes because I though that was the problem in the first place but still is that same thing