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Brakes ... Calling on the experts again. 200

posted by  Green Lantern on  Thu Jul 17 01:22 CST 2003
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last visit: Tue Oct 23 09:01 CST 2001
[RELATED]

Hello everyone. As some of you may know, I had a problem the other night with my brake failure light turning on after I had replaced the brakes on my 1983 242ti. I was able to get the brake failure light to go thanks to the great advice that was given to me from you people. I also replaced the master cylinder as some of you advised just incase I had destroyed the old one by "over-aggressive" brake bleeding. Both of these tasks went very smoothly thanks to your help and I am glad that I did them.

Here is the new problem:
We bled the brakes and dropped the car back down on the ground ... the brake pedal felt normal (about an 1 1/2" above the floor). I warmed the car up and took it for a test drive. First I just warmed up the brakes (everyday driving). Then I did some hard braking stopping quickly from 80 km/h (just about locking them up). After a while the pedal started getting closer to the floor (after about 5 hard brakes). When I pulled back in the driveway I could push the pedal all the way to the floor (the brake failure light did not turn on). Why did this happen?

We bled the brakes for quite a while ... there was clearly no air coming out of the bleeder screws. Could there be a giant air pocket somewhere in the system? If there is a huge air pocket, how do I get it out? I thought about an air pocket in the master cylinder but I did bleed it before installing it. Then I thought maybe I have a brake line leak ... but no visible wetness on any brake lines (I even left the car on a clean section of concrete overnight ... and no drip marks the morning after). Any ideas?

Thanks ahead of time.

Greg






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