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Old 01-25-2003, 09:07 AM
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Post 4 Wheel Disc Brakes

I am wondering if anyone out there knows much about proportioning valves and master cylinders. I own a 1966 GMC truck, and have swapped in the front suspension from a 1980 GMC to give me the front disc brakes. I have now found a rearend from a 1986 Camaro that has disc brakes. I would like to install this rear, but am unsure whether I would have good stopping power with a Camaro master cylinder and proportioning valve. I currently have a Booster out of the previously mentioned 1980 GMC. Would a Camaro Master Cylinder work with that booster? Would I be able to stop properly. I know that the bolt patterns are different, but I can fix that. Any advice would be much appreciated. I am also on a shoe string budget, so the more reasonably priced the better. Thanks a bunch

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Old 01-26-2003, 08:24 PM
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I am not sure what the answers to all your questions are, but I designed the brake system on my hot rod and they work great. I have disc brakes on all four wheels, so I got a master cylinder that was designed for that purpose which is a 69 corvette. I don't think I would use a master cylinder that was designed for disc on front and drums in back. I did not use a proportioning valve. I ran the lines right from the master cylinder to the calipers. My car stops on a dime.
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Old 03-19-2003, 07:13 AM
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Red face

66 GMC Truckin,

I am looking at doing the same with the front of my 1970 GMC K10. Do you have any good information to help this project maybe pictures. Anything that is a real pain! I understand that it will be a real job and have some experience with suspension/brake systems. So I have a slight idea what I am in for, but anything real difficult please mention
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Old 06-30-2005, 09:01 PM
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check the brake websites

check the brake websites classic industries or MP brakes they all have pictures of various installs, as memory serves you need a master cylinder that is designed for disc disc set up as the bores in the disc drum and drum drum are to small and do not move enough fluid, you will need a proportoning valve. You will need residual valves if the master cylinder is frame mounted and lower than the calipers. there are residual valves for drums and disc so make ssure you get the correct valves, they keep a little pressure in the lines when your not applying brakes this keeps the brake pad lightly on the rotor other wise the pad would retract and leave a space between it and the rotor but verify this as I mentioned it is from memory.......good luck double check every thing, I bled my 61 truck brakes and left a bleeder open and about a half mile down the road no brakes, luckily no one was around when it happened, didnt have emergency brakes (waiting on cables) and non synchroed tranny.....so no down shifting
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Old 07-02-2005, 01:31 AM
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i think vette master cylinders are pretty cheap. get a porp. valve from a place like mp thats adjustable
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Old 07-02-2005, 11:50 AM
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http://www.carcraft.com/techarticles/76680/
You can link to the other 6 or 7 pages from there, under "SIDEBAR ARTICLES"

Read several of these:
http://www.stoptech.com/technical/
and
http://www.thebrakeman.com/articles
You'll know which ones.
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