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Q: 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.
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Define brake failure on right front and left rear. No brakes on those two? Brakes locking up? It's not the porp. valve!
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.
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?
No! Booster can NOT cause LOW pedal. Seek a mechanic's hands on help. It is time for that!
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That valve can fail but its very rare. It is typically located below master cylinder mounted on chassy frame.
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