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1 more thing, like D-Man said about the glad hand valves,the 939 series have them in the front too not just in back like the deuce's. steve:ditto:

HI GUY 1 thing we found at the cal guard OMS shop was the brake valve over the rear axle's that feeds air to them (emerg and service) sides would develop a slow leak and also the brake chambers. The best way to check is like sparky said water but the leak can also be on the service side,so try...