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Need help with odd brake problem 200 1990

posted by  P1800nut on  Wed Sep 19 20:58 CST 2012
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last visit: Sat May 31 23:05 CST 2014
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More oddness: I did the test described in the FAQ of holding the pedal steady (after releasing all vacuum) and then starting the motor. The pedal is supposed to drop a little--but it drops a LOT. That's what I noticed when I first checked the car. But what I just realized is that in my tests in the garage, the brakes did work and obviously had boost--it was just that the pedal was near the floor. My son said that was what happened to him at first, but then it went to the point of not braking at all. Does that offer any hints about what's wrong?

BTW, the second part of the test is to hold the pedal steady and then turn off the motor; if the pedal tries to rise, there's a problem. When I tried that, it did NOT rise.

I wish I understood how brake boosters work--maybe then these symptoms would make sense.






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