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If air is leaking from the blue trailer service line without the red knob in, the tractor protection valve is stuck open You will want to use a 3/8 inch wrench to push up on that fitting while pulling the line off. Replacing the valve will fix your issue.
Failure to perform the job correctly can result in personal injury or vehicle damage Otherwise, it is the line for the valve Don't do this job if you think you don't have the experience or the equipment to do this job correctly.
You might think identifying these leaks is straightforward, but the reality is often more complex than it appears
Understanding how to effectively detect and fix these issues can not only enhance your truck’s safety but also save you from unexpected downtime and expenses. Trucks, tractors and buses 1 Insufficient brakes usting, lubricating or relining So far i’ve replaced the dash valve, the floor valve and checked all chambers by pinching off air lines
Nothing has cured it yet What else could it be This truck has a liquid tender bed on it, and the trailer supply line is not used. When you press the brake pedal, see if the brake lights come on
If not, then the leak is most likely the brake switch leaking air on that manifold
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