This is on my 379 dump truck and the pup trailer. The rear air valve on the pup is loosing air from where I’m pointing and the TPV is releasing air from its bypass. It’s losing air at the rear when I release the parking brakes in the cab but the TPV doesn’t bypass until I apply the brake from the pedal. It was mentioned to me, that I probably got a bad brake chamber on this pup causing this.
Tractor protection valve and rear axle valve on pup trailer bypassing air
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Jun 27, 2023.
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