I am having diagonal right front and left rear brake failure. I was told that it could be a proportioner valve
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1994 Buick LeSabre Question: Where is the proportioner valves on this vehicle?
Answer #1milesauto from Miles Auto Service Inc., September 26, 2013, 11:39Master
That valve can fail but its very rare. It is typically located below master cylinder mounted on chassy frame.
Replymichhl, September 28, 2013, 05:59Rookie
Thank you. I did find where the valves are located on my vehicle.
Answer #2pushrod September 26, 2013, 18:50Master
Define brake failure on right front and left rear. No brakes on those two? Brakes locking up? It's not the porp. valve!
Replymichhl, September 28, 2013, 05:56Rookie
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.
Replypushrod, September 28, 2013, 07:26Master
Poor/low brake pedal?
Replymichhl, November 09, 2013, 08:58Rookie
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?
Replypushrod, November 09, 2013, 09:12Master
No! Booster can NOT cause LOW pedal. Seek a mechanic's hands on help. It is time for that!
Replymichhl, November 09, 2013, 09:58Rookie
ok. Was leaning towards that. I've did all I can do on my own. Thanks.
Replypushrod, November 09, 2013, 10:06Master
Smart move! Hope you get it back on the road. Cant play around much with the brakes!
Replymichhl, November 10, 2013, 14:58Rookie
Your right about that. Thanks for your help. I'll stick to things I can do.