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Yes, the right front one needs to be vented... early ones had the little cap vent, like an axle vent, and later ones just had a hole drilled in em... There is a check valve further back in the system which opens when you pressurize that glad hand to apply the brakes on the towed truck... if a...

I would check the MC for a lazy return.. there is probably crud in the system.. the hydraulic switch on the MC was replaced by a Air one.. by MWO and it could be full of water.. drain those air tanks... when the brake lights are on... you have thirty seconds you say... have a wrench on one of...