Where is the proportioner valves on this vehicle? on 1994 Buick LeSabre

I am having diagonal right front and left rear brake failure. I was told that it could be a proportioner valve failure problem.

by in Jersey City, NJ on September 26, 2013
2 answers 8 comments
ANSWER by on September 26, 2013
That valve can fail but its very rare. It is typically located below master cylinder mounted on chassy frame.
COMMENT by on September 28, 2013
Thank you. I did find where the valves are located on my vehicle.
ANSWER by on September 26, 2013
Define brake failure on right front and left rear. No brakes on those two? Brakes locking up? It's not the porp. valve!
COMMENT by on September 28, 2013
Yes,no brakes on left rear and right front. Did have a bad caliper on right front. Replaced and still no brakes. Left front and right rear fine. I don't know.
COMMENT by on September 28, 2013
Poor/low brake pedal?
COMMENT by on November 09, 2013
Yes, brake pedal low and sound like air flowing through when pedal compressed. Had good brake pressure and then lost again. Could it be booster?
COMMENT by on November 09, 2013
No! Booster can NOT cause LOW pedal. Seek a mechanic's hands on help. It is time for that!
COMMENT by on November 09, 2013
ok. Was leaning towards that. I've did all I can do on my own. Thanks.
COMMENT by on November 09, 2013
Smart move! Hope you get it back on the road. Cant play around much with the brakes!
COMMENT by on November 10, 2013
Your right about that. Thanks for your help. I'll stick to things I can do.