Why is there no air on the Blue Line?
Why is there no air on the Blue Line?
If, air is leaking ONLY through the blue line, then it would probably have to be the TPV is leaking on the blue side. Even if the red dash valve leaks out to the TP control port, there is still no air on the blue line unless a service brake application is made.
How does a blue Park valve work on a tractor?
I have four trucks with the blue knob and they are spring loaded. If the yellow knob is pulled out, (setting parking brakes) the blue knob has no pressure. To move the tractor you have to push both the yellow which charges the port for the blue valve, then push the blue knob to release the tractor brakes.
How does the parking brake work on a truck?
The way the parking brake system works on most trucks is there are springs in the air chambers on the rear axle or axles of the truck that apply the parking brakes. When you push the parking brake knob in, this supplies air to those air chambers and pushes against the springs to release the parking brakes.
How can I troubleshoot my air brake system?
AIR BRAKE SYSTEM TROUBLESHOOTING 1.) Before replacing any valve with a new or remanufactured valve, be sure to blow the air lines out either using the vehicle’s own air supply or shop air. Dirt is the greatest cause of premature air valve failure. 2.) If pipe dope is used on fittings, use it sparingly.
I have four trucks with the blue knob and they are spring loaded. If the yellow knob is pulled out, (setting parking brakes) the blue knob has no pressure. To move the tractor you have to push both the yellow which charges the port for the blue valve, then push the blue knob to release the tractor brakes.
The way the parking brake system works on most trucks is there are springs in the air chambers on the rear axle or axles of the truck that apply the parking brakes. When you push the parking brake knob in, this supplies air to those air chambers and pushes against the springs to release the parking brakes.
Where do you put the park brake on a prime mover?
Applying the park brake in the cab of a prime mover should apply the spring park brakes on the prime mover and all connected trailers by venting the air from the supply system.
Where to test the park brake on a truck?
On flat level ground, with both truck and trailer wheels chocked to prevent the vehicle combination rolling away, test the park brake function by applying the park brake in the cab of the truck without the service brakes applied. All normal workshop safety procedures and requirements must be met A.
