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Could be a torn diaphragm on the spring brakes. If that is the case you will need to isolate the one or more that are torn and replace the entire assemblies. Up to 4 assemblies. Procedures are in the TMs.

DO NOT replace the diaphragms on the spring brake canisters! I only replaced the diaphragms on the Non-spring brakes since they are safe to work on. The spring tension in the spring brakes can release with EXPLOSIVE force and take your head off or cause severe injury! Just buy new assemblies...

Had the same problem with my latest M923. Ended up being 2 leaking diaphragms in the front wheels.

Anyone have an answer as to where to check on my air system problem? Read above.

Try shutting the valve off above the tank that is behind the long tool box and see if it does the same thing it did on my truck.

I have a similar problem with my newly acquired M923. When I pressed the brake petal it dumps a lot of air into the intake stack. The 2ndary air pressure gauge drops pressure rapidly. We ended up turning off the shot off valve above the 2ndary air tank to stop the system from loosing a lot of...