Losing air 5-6 psi per minute while driving

Check

Check rhe firewall pass through. They’re notorious for leaks there.

 

May 18, 2019

 

Your air ride could use that much air.

 

I have freightliner cascadia 2015 truck is parking .engine is running. slow air built 5 minutes to purge. Start loosing air and purge cycling every 1 minute. When shutting of the engine its hold the pressure. no stattic air leak .for fan cluch I have swith to cut off the air . No change.replaced new air compressor new discharge hoses new tank new air dryer and governor. On gagues the secondary gague start loosing air. Truck is parkin and running no brake transmission is on N.