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 , September 26, 2013
That valve can fail but its very rare. It is typically located below master cylinder mounted on chassy frame.
COMMENT by , September 28, 2013
Thank you. I did find where the valves are located on my vehicle.
ANSWER by , 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 , 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 , September 28, 2013
Poor/low brake pedal?
COMMENT by , 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 , November 09, 2013
No! Booster can NOT cause LOW pedal. Seek a mechanic's hands on help. It is time for that!
COMMENT by , November 09, 2013
ok. Was leaning towards that. I've did all I can do on my own. Thanks.
COMMENT by , November 09, 2013
Smart move! Hope you get it back on the road. Cant play around much with the brakes!
COMMENT by , November 10, 2013
Your right about that. Thanks for your help. I'll stick to things I can do.