DJG Posted July 5, 2017 Share Posted July 5, 2017 (edited) Need some help a friend gave me a 1985 Mack dump truck to fix after he changed out a lot air valves the problem started with a bad brake chamber he replaced it with a new one and he told then air started leaking from the back left side relay valve when brakes are released so I took all the valves apart they all ok air is getting to all of them. it is a MODEL DM685S Thanks Dan Vin #1M2B120C1FA055812 Edited July 5, 2017 by DJG added content Quote Link to comment https://www.bigmacktrucks.com/topic/50380-air-leaking-from-relay-valve/ Share on other sites More sharing options...
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