Re: 73 brake booster master cylinder on a 69 c10
Welcome! Is your 69 4 wheel drum as original, or is it a disc/drum conversion? Are you running a power brake booster on the 69 or not?
4 wheel drum brakes don't require a proportioning valve. You should look into bore size on the 73 MC if you are NOT running a booster as different piston sizes will change brake pedal effort and feel.
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