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Old 07-22-2013, 11:59 AM   #7
Ridgeclimber
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Join Date: Jul 2012
Location: Maple Ridge. B.C.
Posts: 145
Re: 1968 c10 brake proportioning valve

Is your master cylinder new? It's hard to tell from the picture. If the master cylinder is used, maybe the cup seals in the master cylinder could be leaking by causing the pedal to go down. If the master cylinder is new. Start by bench bleeding it, slowly. Don't pump it hard and fast. If there is air in it you could break up the air and air rate the fluid. Then instal the cylinder and start by bleeding the right rear wheel first. Then left rear, then right front then left front. Again pump the pedal slowly and don't turn the air and fluid into foam. Good luck.
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