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is it possible for my booster to have a small leak in it. my symptoms are no real pressure the first 2 pumps with good pressure on the third pump. i have bled the entire system, theres a new master cylinder (for a 92 16v) and my brakes are off a vr6 all the way around.
here are some of my theories....
(1)the master is too small, not sending enough "juice" until the third pump, i say this because a 92 16v brake setup has 9.4" brakes in the front and i have 11".....
(2)the booster has a leak in it, which is why the 3 pumps are required, the pressure holds good on the third pump but as soon as u let go, u have to start over, also theres a weird clicking that comes from the pedal sometimes when applying pressure.....
(3)somewhere in the brake lines there is a leak that causes this, its unlikely but something that haunts me in the back of my mind.....
SO WHO CAN HELP ME?????
 

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Re: CAN A BOOSTER LEAK??? (2manvr6)

If the pedal seems very hard for the amount a braking occuring, I would suspect the booster...or any possible vacuum leaks that are weaklening the efficiency of the booster. Check all vacuum hoses too.


[Modified by TrueValue, 6:25 AM 1-30-2003]
 

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Re: CAN A BOOSTER LEAK??? (2manvr6)

Does your symptom occur if you havent moved the car between depressing the pedal? If not...
You might also check to see how much retraction you are getting from the caliper pistons when moving (can be a little tough to simulate, and its very hard to stop without using the brakes). If something is pushing one of them way in, like a sticky set of caliper float pins plus a little rotor warp combined you will have to pump a couple times to get that caliper piston extended each brake operation.
 
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