picked up truck after having it serviced a
2002 Volvo VNL 780
VIN 4V4NC9TJ12N331024
Engine serial ISX 475HP 14020915
shop is closed had to drive home with this, there is 115 psi in air tanks , breaks release, air to suspension.
No Air to Splitter or Cab air bags or to raise or lower suspension or engage rear differential.
any help would be appreciated.
2002 Volvo VNL 780 Air PSI Issue
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JRK, Aug 1, 2021.
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Sounds like the pressure protection valve is sticking. Probably located on one of the air tanks.
spsauerland Thanks this. -
I hope he can correct that. Wow. The mechanical forces released that Truck to soon. My goodness I hope its doesn't cause a incident on the highway. Might want to U Turn and get back there asap, what if the brakes all apply at the same time..... yikes.
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Purpose of the pressure protection valve is to protect air supply for the brakes. All it is is a valve that won't let air flow from the tanks to the air operated accessories until a specific system pressure is reached. Ever notice how once a truck hits about 90 PSI the cab and suspension inflate? That's the pressure protection valve opening.
spsauerland and Goodysnap Thank this. -
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