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So you believe the problem lies in the air pack? The only moving part in it is a switching valve in the back of the air pack besides the piston and rubber bladder, I don’t know a whole lot about the air pack but it did receive a fresh rebuild very recently, would the problem possibly be in any...

thank you I will def check that and make sure it is within specs.

Thanks for the advice, I am wondering if it might be a switching valve in the air pack, now the glad hand and valve your talking about would be the service glad hand or the emergency glad hand valve? The rear service glad hand on the passenger side of the truck in the back, when I open the valve...

I had previously posted some issues with brakes on my m813a1. Since then I have rebuilt the air pack and installed it, and installed a new master cylinder today, then I bled out the master cylinder, and air pack then the axles according to the pubs, I started and operated my truck. Previously...