LeonbergerG Posted August 18, 2014 Report Share Posted August 18, 2014 Working on a '78 c10 for a buddy of mine. The Master cylinder is sucking fluid out of the front reservoir (Rear Brakes) and Pumping it into the Rear Res.(Front Brakes) New Re maned M/C i am Warrantying it out and try another but could the Prop Valve be bad? Also if it is could i bypass it? this truck is probably inits last days and wont be around much longer but does need to be safe. Thanks Quote Link to comment Share on other sites More sharing options...
Cordell Posted August 18, 2014 Report Share Posted August 18, 2014 Sounds like an internal leak in one or the other, never felt with that before. Quote Link to comment Share on other sites More sharing options...
Nickey4271647545519 Posted August 18, 2014 Report Share Posted August 18, 2014 Those older GM prop valves are known for going bad. Yes you can bypass it, but you will need an adjustable prop valve. Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted August 19, 2014 Author Report Share Posted August 19, 2014 I just ordered one from summit, about 60 shipped.not to bad Quote Link to comment Share on other sites More sharing options...
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