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'93 Rd Parking Brake Problems


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I have a '93 Mack RD that has a problem with the parking brake. The Yellow valve will not stay in. I took the supply line off the valve and there was very little air when the truck had full pressure. I traced the line to some sort of check valve that has 5 air lines going to it. Two of them come from the tanks and seem to have good pressure. Does anyone know what this valve is, or where the other lines lead to on this valve? It is located on the rear of the frame crossmember just aft of the cab on the driver's side.

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