McTrucking Posted August 16, 2017 Share Posted August 16, 2017 New to Mack trucks ,I have a 2010 CHU 613 dump truck ..when I set the parking brakes it seems like it's taking longer for them to engage than normal and also is not evacuating the normal amount of air when you first pull the knob on the dash ...just wondering why it's all the sudden doing that ...thanks in advance Quote Link to comment https://www.bigmacktrucks.com/topic/50793-2010-mack-chu-613-parking-brake-slowly-engaging/ Share on other sites More sharing options...
mrgumby Posted August 16, 2017 Share Posted August 16, 2017 maybe you need a new relay valve Quote Link to comment https://www.bigmacktrucks.com/topic/50793-2010-mack-chu-613-parking-brake-slowly-engaging/#findComment-377683 Share on other sites More sharing options...
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