Quote:
Originally Posted by treveiger
I looked online and it seems the 71-79 brake mc are the same. The prop valve would have to work on a 71 brakes wouldnt it? Did the manual breaks have different prop valves than the power breaks? I have a power break set up with some kind of a valve but idk if itd work. It doesnt look like the one above. Its off a 71-72 gmc c15.
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Prop valve from a '71-at least '79 will work. Manual brakes used the same prop valve, but a different master cylinder. 3/4 tons use a different booster and master than 1/2 tons, so if you have a 1/2 ton booster, get a 1/2 ton master. The booster in post #9 and the first truck in post #14 are 3/4 tons, the last booster pic in #14 is the 1/2 ton.