Combo valve for rear disc 3rd gen?
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Joined: May 2008
Posts: 286
Likes: 1
From: Cicero, IL.
Car: 1987 Pontiac Firebird Trans Am WS6
Engine: SBC 350
Transmission: T-56
Axle/Gears: 3.70:1 BW M78 9-Bolt Posi
Combo valve for rear disc 3rd gen?
"Did GM use the same combo valves for front disc/rear drum cars and 4 wheel disc cars? Is that why my rear brakes barely do anything? I've heard of changing the plugs to alter the front and rear bias? Also, I've heard that combo valves are for cars with rear drums. Should 4 wheel disc cars just have a prop valve instead of a combo valve? Sorry, I never knew too much about brakes."
Last edited by JamesC; Aug 3, 2013 at 08:36 PM.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Combo valve for rear disc 3rd gen?
"Did GM use the same combo valves for front disc/rear drum cars and 4 wheel disc cars? Is that why my rear brakes barely do anything? I've heard of changing the plugs to alter the front and rear bias? Also, I've heard that combo valves are for cars with rear drums. Should 4 wheel disc cars just have a prop valve instead of a combo valve? Sorry, I never knew too much about brakes."
JamesC
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