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I'm also losing air out of intake stack when parking brakes are set truck off. Very small leak but You can still hear it replacing all service and parking diaphragms today I'll update on the outcome

Yeah I understand that it's normal, I just don't know what's causing it to leak air, bad diaghphrams or bad valve or both.

I'm replacing all of those today, but the Pto still throws me off. I know on my truck engaging the Pto locks the breaks up so that could be related, but the power divider valve is leaking out of the vent cap on it.

Slo do you have any experience when Pto engaged it loses air and revs high to try to build

I don't know when it's operating correctly what it revs to, bought the truck 3 weeks ago and totally new to it. I know civilian wreckers you don't want to idle past 1500 rpm Max

Well currently revs to limiter to compensate for the air leaking out of intake stack and power divider bleeder

I have a 90 m936 a1. When I engage the Pto for the crane air is coming out of the end of the Pto control valve and also Out of the intake stack. Also when you hold breaks at a stop light I'm losing air out of the intake stacks. Could these be related? New to the military vehicles and any help...