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An easy check to see if the OUTER seals are leaking is to check the axle breather, If it is releasing air when the tires are trying to fill one of the outer sets of seals on that axle are bad. I replaced all my axle breathers with fittings and ran the hose up to the back of the cab. When I took...

One other thing to check is on the CTIS manifold, there is a screw in pressure sensor, it has two wires running to it. Mine was physicaly broken off, this would cause the dash display to say "flat" I called CM automotive and they sent me a new pressure sensor for free. Thanks CM.

If your buzzer comes on I think your air priority valve is suspect. The valve shouldn't let the CTIS air demand overide the Brake system PSI. I think at about 60-70 PSI it should cut the air to the aux systems and direct the air only to the brakes. This is a VERY unsafe condition as it will...

Mine are epoxied on. This is another point of failure to look into. It would be very hard to diagnose with the brake drum on. It would sound like air leaking from the brake backing plate... and once the brake drum is off and the hub is apart there is no way to hold air pressure on the hub...