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Mack Metro-Liner air leak


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Metroliner CSMR has small air loss at idle and dumps air ( I think from the rear brake circuit )  with just three applications of service brake.

The treadle valve has already been replaced .  No air leaks in the cab.

Reading an earlier post about a Granite seemed similar and it was suggested he had a problem with a "combo valve"  ??

Any comments / help appreciated.

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