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After i had the issue with my air drier, i had an air leak on the ctis dump valve on a rear axle. tried to find a replacement to no avail. i took it off and took it apart ( very simple valve). it had a piece of metal that looked like a piece of pipe thread stuck under the diaphragm. no cost fix...

On the trip home from Ripley in my m931a2, i lost primary air. it turned out the filter on air dryer unscrewed. messed up the threads,had to bypass it to get home. the dryer had been replaced in 2012. they must not have tightened the filter.