rumatt
05-24-2005, 08:21 PM
I found this brake question interesting. Any thoughts? This guy answers a lot of questions in the E30 forum over there and has helped me as well.
http://forums.bimmerforums.com/forum/showthread.php?t=362049
A master cylinder that irradically looses seal sounds odd. :scratch:
At the BMW CCA SD Autocross this weekend i was giving students rides around the course and in a hard braking zone my pedal suddenly sunk halfway to the floor and i had drastically reduced braking power and went straight off the course. I pumped the brakes and the pedal came back. I had brakes for the rest of the run, then on the next run it did it twice out of about 20 braking zones per run so i parked the car. No brake fluid leaks, calipers are all dry, so i'm thinking it's a failing master cylinder. I had similar symptoms on my Golf GTi about 15 years ago and it turned out to be a bad master. The primary circuit was failing but the secondary circuit at least gave me some braking power (about 30%).
I drove the car 125 miles home and about half the time the pedal would be fine, and the other half it would sink halfway down and i had to pump em to get the pedal back. I made it home safely and parked it in the garage.
So does this sound like a failing master cylinder? It has 176,000 miles on it, the last 35K of those being hard miles compliments of me.....
http://forums.bimmerforums.com/forum/showthread.php?t=362049
A master cylinder that irradically looses seal sounds odd. :scratch:
At the BMW CCA SD Autocross this weekend i was giving students rides around the course and in a hard braking zone my pedal suddenly sunk halfway to the floor and i had drastically reduced braking power and went straight off the course. I pumped the brakes and the pedal came back. I had brakes for the rest of the run, then on the next run it did it twice out of about 20 braking zones per run so i parked the car. No brake fluid leaks, calipers are all dry, so i'm thinking it's a failing master cylinder. I had similar symptoms on my Golf GTi about 15 years ago and it turned out to be a bad master. The primary circuit was failing but the secondary circuit at least gave me some braking power (about 30%).
I drove the car 125 miles home and about half the time the pedal would be fine, and the other half it would sink halfway down and i had to pump em to get the pedal back. I made it home safely and parked it in the garage.
So does this sound like a failing master cylinder? It has 176,000 miles on it, the last 35K of those being hard miles compliments of me.....