GBodyForum Supporting Vendor

Brake proportioning valve

Keep it clean! :)
Royal Smart Person
Posts: 903
Joined: Mon Jun 19, 2006 3:14 pm
Location: San Antonio, Texas

Brake proportioning valve

Postby srercrcr on Wed Jul 30, 2008 4:04 am

I think mine is defective cause I'm not getting any pressure to the front calipers, just the rear. I wouldn't be opposed to defeating the separate front to rear in the good old days. Why couldn't I replace it with a simple junction block, all lines merging at that spot? Anybody seen such a block offered in the aftermarket?
Steve R
78 Grand Prix LJ - one owner
I sell GM service manuals and some GP parts

User avatar
Royal Smart Person
Posts: 13245
Joined: Fri Mar 31, 2006 2:30 pm
Location: Kitchener, Ontario

Postby pontiacgp on Wed Jul 30, 2008 8:37 am

your rear brakes will locking up every time you hit the brakes if you aren't using a proportioning valve...

Free Shipping on Orders Over $75!
User avatar
85 Cutlass Brougham
Royal Smart Person
Posts: 6889
Joined: Fri Sep 01, 2006 1:28 am
Location: Tampa Bay Area

Postby 85 Cutlass Brougham on Wed Jul 30, 2008 10:37 am

Plus, the prop valve also contains a residual pressure valve to keep the rear brakes in adjustment. If you remove this, the wheel cylinders will retract too far and the back brakes will fail to function.
1985 Cutlass Supreme Brougham (ex pizza delivery beater with 240,000 miles):
355 Chevy- 9.5:1 compression, Comp XE 262 cam, World S/R Torquer heads with 2.02's, Edelbrock Performer, 800CFM Q jet, Camaro ram air system,Edelbrock headers, Comp Magnum roller tip rockers,TH 200 4R, 3.23 rear, aluminum hood, IROC steering box, poly bushings, Eibach springs, etc. Cutlass build thread here: viewtopic.php?t=4982
Also: The Thing That Won't Die-1998 Nissan Frontier, 340,000 miles of pizza delivery.

Free Shipping on Orders Over $75!

Return to General Discussion

Who is online

Users browsing this forum: Dburger, RustRocket