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Need help with odd brake problem 200 1990

posted by  P1800nut on  Thu Sep 20 22:44 CST 2012
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last visit: Sat May 31 23:05 CST 2014
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Just finishing replacing the master cylinder--and no change in the symptoms. Grrr.

Bled the system and had a nice firm pedal. But as soon as I started the motor, the brake pedal sunk, almost to the floor. Turn off the motor, pump a couple times, and the pedal is firm again.

So now what???? I'm thinking of going back to my original plan of replacing the vacuum booster. But I am perplexed that even though the pedal sinks, the brakes do work, and they're clearly boosted.

Any other theories before I plunk down the $100 and attack those four tricky nuts?






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New Need help with odd brake problem [200][1990]
posted by  P1800nut  on Wed Sep 19 19:50 CST 2012 >


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