Question about 1999 Chevrolet Malibu

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I have a problem with my brakes, it's not the brakes or rotors. just sometimes the brakes go to the floor and dont stop, and other times they are amazing, sometimes even touchy. What could be my problem?

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Could be two things:

Most likely master cylinder piston leak.
Rebuild / replace master cylinder ($80)

Otherwise there may be air in the brake system.
Bleed brake system ($20)

Might want to bleed first ... see what other experts recommend.

Posted on Sep 30, 2009

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I changed the front rotors and brake pads once i was done i started the truck and the brake pedal went to he floor and the dash ifo said to service brakes. since than the brakes have been hard and...


It went to the floor because you had to compressed the piston to get it over the new pads and rotors. The brakes need to be pumped up after you replace pads in order for the pistons to come back in contact with the new pads and take up the gap. Pushing the pedal to the floor is never a good idea and a good way to ruin a master cylinder in older vehicles.

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Well this is very serious I hope you deal with it right away. You mentioned that sometimes the pedal was hard,do you mean that its all the way up and it doesnt feel like you have power brakes?? If so have you noticed any sounds like air escaping (swoosh sound when brakes applied)? Failure of the power booster causes pedal to become very hard and could possibly be your problem for hard pedal if I understood you correctly. check to make sure that vacuum to the booster is conected properly and hose not kinked..Now for the solution for the pedal fading to the floor... You either have air in your brake system, A bypassing master cylinder , or a hydraulic leak...Were your brakes serviced recently?? if so try bleeding your brake system first...That would be the first step if still the problem persist I would isolate exactly where the problem was coming from.. To do this you would start at the passenger rear wheel and line clamp the brake hose to make that part of your brake sytem inoperable...when clamped try your brakes and note if brakes improved or had know affect on system (when testing obviously im not suggesting you drive to determine results of test procedure)repeat test for each wheel you have isolated the problem when brakes feel normal with one wheel clamped,which ever it may be.. This isnt as hard as it might soun and if you are confused at all dont hesitate to ask questions... Remember the only dumb question is the one you fail to ask I would hate for you to get into an accident ... Good luck!!!

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