So on the firewall u have the manifold with all airlines the one next to it is just capped off well it looks like one of the caps blew out now when I go to engage or did engage I here air and feel air coming out takes forever to set breaks or release trailer brakes if u cap it off then u can't disengage brakes this morning went to leave and now my tractor brakes won't disengage
Air leak on firewall 2018 peterbilt
Discussion in 'Flatbed Trucking Forum' started by David mcgill, May 9, 2021.
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Some valves have a vent tube out the firewall. Maybe supposed to be open. Check the hand valve is fully released.
A bit more information would help. Service brakes, parking brakes etc.
It you turn off the engine with truck in gear. Pull the parking brake knobs. Then go disconnect the trailer glad hands. Any air still there? -
Isafarmboy and cke Thank this.
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