Proportioning valve mod/Better rear brakes update
Joined: Aug 2006
Posts: 12,807
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: update
this thread is awesome! i dont care who's right ive got an 87 disc/drum brake car that i swapped the rear to a '02 SS rear with the discs... im thinking of getting rid of the valve alltogether just replacing it with a piece of pipe... if it dont stop, i got tripple A 
front can be straight pressure, but the rear HAS to be biased
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From: The Pocono Mountains, PA
Car: 1987 Firebird, Dad bought it new
Engine: 5.7L Vortec w/ LT4 Hot cam
Transmission: 700r4 transgo shiftkit 2600 stall
Axle/Gears: 3.42 '02 SS 6 spd rear
Re: Proportioning valve mod/Better rear brakes update
no just the rear, im disconnecting my front brakes
Joined: Oct 2001
Posts: 12,221
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Senior Member
iTrader: (10)
Joined: Apr 2007
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From: The Pocono Mountains, PA
Car: 1987 Firebird, Dad bought it new
Engine: 5.7L Vortec w/ LT4 Hot cam
Transmission: 700r4 transgo shiftkit 2600 stall
Axle/Gears: 3.42 '02 SS 6 spd rear
Re: Proportioning valve mod/Better rear brakes update
i do all my own stunts
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Posts: 396
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From: California
Car: 1991 Pontiac Firebird
Engine: 355 TBI
Transmission: 7004R
Axle/Gears: 3.27/42 ?
Re: Proportioning valve mod/Better rear brakes update
Went ahead and tried something different. I got a 1 3/4 spring and installed it. So now I got a problem 
My rears lock before the fronts do.
My car is a 91... with the 1LE rear disk swap.
I tried turning while I had the rears locked and well pretty much your screwed if there's something you need to maneuver around.
Come to think about it, my fronts never really locked before....
My rears lock before the fronts do. My car is a 91... with the 1LE rear disk swap.
I tried turning while I had the rears locked and well pretty much your screwed if there's something you need to maneuver around.
Come to think about it, my fronts never really locked before....
Last edited by Napster134; Aug 6, 2011 at 08:41 PM.
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iTrader: (10)
Joined: Apr 2007
Posts: 773
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From: The Pocono Mountains, PA
Car: 1987 Firebird, Dad bought it new
Engine: 5.7L Vortec w/ LT4 Hot cam
Transmission: 700r4 transgo shiftkit 2600 stall
Axle/Gears: 3.42 '02 SS 6 spd rear
Re: Proportioning valve mod/Better rear brakes update
the knowledge i have gathered from this thread has lead me to believe that if your rear brakes lock first that is good and you should slam the brakes, then slam the gas, then slam the brakes and slame the gas while you drive as fast as possible around turns... they call it "trail braking" and... its awesome
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From: San Diego, CA
Car: 1991 Camaro RS
Engine: LO3
Transmission: 700R4
Axle/Gears: 3.42 LS1
Re: Proportioning valve mod/Better rear brakes update
I originally had rear drums, but I swapped on a LS1 rear end, while replacing the fron with Z51 brakes (basically oversized C5 rotors with C5/LS1 calipers).
So can I modify my old proportioning valve and make it work ? Or do I have to get one from a disc/disc car ?
So can I modify my old proportioning valve and make it work ? Or do I have to get one from a disc/disc car ?
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