1966 Chev PU upgrade to dual master cylinder for existing brakes - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-18-2002, 07:27 PM
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Post 1966 Chev PU upgrade to dual master cylinder for existing brakes

I have read the posts regarding installing a 1973- 79 clip in a 66 chev, but I am looking just to upgrade the existing Master Cylinder to a dual system - in preparation for future disc brake conversion. I was hoping to retain the stock pedal location and possibly location of the Master Cylinder. Modest to nonexistant budget is a consideration. Has anyone done this before and have any ideas what would fit?
Thanks in advance for your help
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Old 10-19-2002, 10:38 AM
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use a master cyl and combination valve from a drum brake mid seventies nova, with some minor adapting this works.
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Old 10-21-2002, 01:17 PM
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BOBCRMAN@aol.com
Thanks for your response. If you can tell me what the minor modification is I can decide whether I can tackle it or should just rebuild the stock juice jar.
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Old 10-21-2002, 07:52 PM
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the bolt holes are different where the master bolts on,do some slot work and the length of the rod has to be changed. then you have to mount the multi valve to something ,run a wire to it if you want an idiot lite . then its regular plumbing on the lines
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Old 10-22-2002, 04:58 AM
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Replaced my single reservoy 64 to duel by taking the old master cylinder to the parts store and matching up the mounting holes. Found a 68 Impala was just fine, cost like $18 but if you intend to go disc on the front, don't know how this would work after you change to front disc. Disc drum mastery clinder at Murrys was $35. Again you will have to match up the mounting holes.
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Old 10-22-2002, 03:12 PM
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I have a 1964 chevy c10 and I used a dual master cylinder from a 1968 chevy pick up. Which cost less than $20. But then I started experiencing problems with my back locking up before my front. So I had to buy an adjustable proportion valve to better control the pressure ratio!!
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Old 10-23-2002, 07:48 AM
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Thanks to all that have posted - I am learning a lot about this. Unfortunately the wreckers around here don't seem to have much of the older stuff in their yards anymore, so I am having trouble finding anything. Probably have to go with a rebuilt unit from a later vehicle. Just want to check something first. It is my understanding that the master cylinders are all pretty much the same in the way they function and the proportioning valve is what does the work to control pressure distribution to avoid lock up. Will switching proportioning valves when I go to discs be a problem?
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Old 10-23-2002, 01:15 PM
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Yes it will affect your braking that's why I had to install a adjustable porportioning valve. I purchased this item from SUMMIT RACING CATALOG!!
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