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W30post · 10-28-2007, 06:35 PM

I have a failure on a rear brake system on a GM car that isn't my Oldsmobile that I think is because I had a total failure of pressure to the rear of the car. I replaced the bad wheel cylinder and now the master cylinder but when I try to bleed the system all I get is a very slight drip from the rears. The front is ok.

I think the rear is being checked off by the proportioning valve in fail safe mode. Is there a way to reset this valve or is it shot now and has to be replaced? This is kind of off topic from Oldsmobile but still may help someone else out if an answer is given.

Anybody know how to correct this proportioning valve?

10-28-2007, 06:35 PM	#1 (permalink)
W30post Member Join Date: Oct 2007 Posts: 33	Proportioning valve question I have a failure on a rear brake system on a GM car that isn't my Oldsmobile that I think is because I had a total failure of pressure to the rear of the car. I replaced the bad wheel cylinder and now the master cylinder but when I try to bleed the system all I get is a very slight drip from the rears. The front is ok. I think the rear is being checked off by the proportioning valve in fail safe mode. Is there a way to reset this valve or is it shot now and has to be replaced? This is kind of off topic from Oldsmobile but still may help someone else out if an answer is given. Anybody know how to correct this proportioning valve?