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#1 |
http://public.fotki.com/street
Join Date: Nov 2002
Location: Winnipeg, Canada
Posts: 169
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Does a 71 have a proportioning valve
I am converting my 64 over to a manual front disc set up from a 71. I am using master cyl etc. The truck I got it from didnt seem to have a proportioning valve for the dic set up. Did they use one in 71 ????
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#2 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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it should have one. sounds like someone did some hacking. i dont know why anyone would remove the prop valve
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#3 |
Senior Member
![]() Join Date: Feb 2001
Location: Killen, Alabama USA
Posts: 3,574
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Yes, 71 has a proportioning valve. I have converted a few '66 trucks to front disc and used the '66 master cylinder with no p.v.
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#4 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Yes. And No. Starting in 1970 or 1971 GM went from the distribution block with a separate proportioning valve to what they called a combination valve in their cars. Trucks should all have the Combi. Valve. This valve is right below the master and incorporates residual pressure valves if required and f/r brake bias in addition to the fluid circuit switch that triggers the light on the dash. This is longer than the distribution block you would find on a drum brake truck. On 71-72 it has two lines coming out, 1 for front and 1 for rear. On 73 and up trucks it has 3 outlets, one each for front and the rear. (I used one of these with a plug in one of the fronts for my disc conversion.)
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