gb20 Posted May 16, 2009 Share Posted May 16, 2009 My brakes don't work but I can pump them and get a good pedal feel as long as the car is off, but as soon as the car turns on, I lose all pedal. Is this a sure sign of a bad brake booster? Quote Link to comment Share on other sites More sharing options...
freakshow Posted May 19, 2009 Share Posted May 19, 2009 Sounds like a bad master cylinder, or the other common suggestion is the reaction disk. Are your brakes all bled properly? the reason you get good pedal feel when the car is off is you are using the remaining vacuum in the booster. My cadillac had this problem, changed out the master cylinder, no more problem. Look for leaks under the car, by the wheels and all the lines before you start going crazy. Quote Link to comment Share on other sites More sharing options...
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