Brake proportioning valve - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-01-2007, 08:29 PM   #1
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Default Brake proportioning valve

What would happen if I connected the left rear brake lines without the proportioning valve? It broke and my dad'* dumba$* thinking ruined it.

'93 H body car
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Old 11-01-2007, 08:40 PM   #2
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Good question. Rears would lock up and the fronts woudn't get enough? Maybe the other way around? I don't know which way the valve works.
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Old 11-01-2007, 08:44 PM   #3
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My Forester is like totaled and I apparently don't have rental car coverage. In the meantime I really wanted to fix this '93 Lesabre of a friends thats sitting out here so I'd have something to drive
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Old 11-01-2007, 09:37 PM   #4
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are you refering to the check valve near the rear driver side door? cuz im almost 100% sure that the proportioning valve is part of the master cylinder.

can anyone confirm?
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Old 11-01-2007, 09:39 PM   #5
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Quote:
Originally Posted by samueljackson
are you refering to the check valve near the rear driver side door? cuz im almost 100% sure that the proportioning valve is part of the master cylinder.

can anyone confirm?
Yes, I'm talking about the two cylinder things there underneath by the driver'* side rear door. I searched and figure they are proportioning valves...why would there be a check valve though?
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Old 11-01-2007, 09:41 PM   #6
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Quote:
cuz im almost 100% sure that the proportioning valve is part of the master cylinder.
I think you are right. I have not seen a seperate proportioning valve on a Bonneville.
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Old 11-01-2007, 09:46 PM   #7
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Quote:
Originally Posted by TheDude
Quote:
cuz im almost 100% sure that the proportioning valve is part of the master cylinder.
I think you are right. I have not seen a seperate proportioning valve on a Bonneville.
this is a lesabre tho right? i know same thing. but on my 92 C bodies, the p.v is in the m.*.

so if the check valve was bypassed, there would be no difference at all, untill a leak occured.
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Old 11-01-2007, 10:26 PM   #8
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My bad, but yes, a '93 Lesabre Limited

What good does this check valve do? I'm tempted to not put it back if it really isn't a proportioning valve.
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Old 11-01-2007, 11:13 PM   #9
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Quote:
Originally Posted by F14CRAZY
My bad, but yes, a '93 Lesabre Limited

What good does this check valve do? I'm tempted to not put it back if it really isn't a proportioning valve.
it only lets fluid, and air go in one direction. like a diode if that helps.

i thought of skippin mine one time it was leaking. i just figured they put it on for a reason, so i got a JY one.

im not really sure of the purpose to be perfectly honest.
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Old 11-01-2007, 11:25 PM   #10
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yeah I *'pose I'll pick up a junker tomorrow
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