Proportioning Valve
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From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
Proportioning Valve
i have a question. can a second design J65 Proportioning Valve be used on a first design J65 braking system. i have an 88' Iroc with rear disk brakes, which really suck and do not work 
. if not, what proportioning valves can be used with the first design J65 braking system. Thanks in advance.
. if not, what proportioning valves can be used with the first design J65 braking system. Thanks in advance. 
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
What do you mean by "first design" and "second design"? In mid 1989 the size of the front brake lines was changed from M1.0 to M1.5, so without changing your lines and hoses, the latest valve you'd be able to use would be the 1989 first design.
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Supreme Member
iTrader: (2)
Joined: Jul 2001
Posts: 1,823
Likes: 1
From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
Thanks for the info. I thought there was a differnce in the hose size, but now i am sure. There is this prop. valve on an 89 GTA i wanna pull. It has PBR single piston calipers on the rear and single piston cast iron calipers on the front. If the hoses are the same size will it work on my 88' with cast iron front and rear single piston calipers. Any info is appreciated.
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88' IROC-Z, 350 TPI, 700-R4
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88' IROC-Z, 350 TPI, 700-R4
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