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Old 03-15-2022, 11:02 AM   #11
70STOVEBOLT
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Join Date: Jun 2005
Location: Winona Lake, IN
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Re: 1968 C10 disc brake conversion- MC question

You have what appears to be a 3/4 ton master cylinder and booster. The valve below the master is not a proportioning valve, but a distribution valve that will not work with disc brakes. You will need to get a master cylinder, booster, and prop valve for a 71-72 half ton and you can either use the original hard lines or buy new lines and you will need new hoses for the calipers, along with the spindles. Member Pickmup (Frank) sells a complete master/booster/prop valve kit for 1/2 tons.
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