my brakes are acting up!

[95DarkGreenGTS]

hey so lately ive been noticing that when I come to a stop ill be sitting there for a min. then all of a sudden the brake pedal looses pressure and goes in further then get pressure again. so what do you think it is brakes need bleed, brake cyclinder going bad? help

 

[95DarkGreenGTS]

anyone anything

 

[FaykSaleen]

Hm.. is the brake fluid level fine? Most likely the master cylinder is on it's way out.

 

[2slo95fiveoh]

Hmm... sounds like either the master cylinder, or the brake booster is having a random problem..
If you shut the car off with the brake pedal applied, then does it do the same thing, or just remain a high and hard pedal?
If (while the car is off) the brake pedal falls, then i think that the primary piston cup in the master cylinder is leaking, causing
brake fluid to escape, causing the low pedal, however, for it to drop, then return in pedal height sounds odd. If (while the car is
off) the brake pedal stays at it's regular height (or higher) than i think there is an air leak at the Brake booster check valve. While
the engine is running, engine vacuum helps build up assistance for the brake booster. If the check valve was randomly failing, then
you would momentarily loose that power assist, causing the brake pedal to drop, then rise again.

 

[95DarkGreenGTS]

ok well it gets hard if you pump the brakes while cars off. How do I check for the air leak? Im clue less on that

 

[Y3LL0wStangGT]

just by the sounds of it my camaro that i just sold did the same thing for the most part and it was the master cylinder.

 

[95-stang]

It points to the master cylinder, dont wait till it fails altogether...........