Freightliner says this is a common problem with DD12 transmissions built before August 2016. The issue is a split rod bushing. Service letter...
You will need to replace the airline push-type connector for the 1/4" compressed-type fitting, which will solve your air leak problem.
I have a problem with my 2014 Peterbilt 579. When the truck is of a LOW VOLTAGE DISCONNECT message comes on on the dash and the engine would be...