What does a bobtail valve do?
A bobtail proportioning valve will reduce braking to the drive axle brakes by up to 75% when unhooked from the trailer. When a semi-trailer is removed from the truck, the truck is called a bobtail.
How does a trailer control valve work?
What do Trailer Control Valves provide? Trailer control valves optimize braking of tractor/trailer combinations by translating hydraulic input signals from tractors into pneumatic output signals to the trailer braking system.
What is the function of a bobtail proportioning relay valve when in operation in bobtail mode?
During bobtail tractor operation, the BP-R1™ valve improves controllability and reduces stopping distances by reducing air pressure to the rear actuators/ chambers, whose axle load has been greatly reduced.
What are the symptoms of a bad or failing expansion valve?
Symptoms of a Bad or Failing Expansion Valve (Orifice Tube) Cost of Replacing a Bad or Failing Expansion Valve (Orifice Tube) Common signs include the AC system working worse than usual, frost coming from the vents, or the AC compressor constantly running.
What are the problems caused by bad valve adjustment?
Damaged Valves. The most serious result of incorrect valve lash adjustment is damage to the valves and related components. Setting the clearances loosely causes parts of the valve mechanism to hammer together, damaging valves and creating a knocking or rattling sound.
What are the symptoms of a bad transmission valve body?
When you experience a symptom of a bad transmission valve body, it is very noticeable. Chances are that you won’t let it go for too long because it will greatly impact your driving ability and will likely frustrate you while trying to change gears. Below are four common symptoms of a bad transmission valve body.
What causes an air brake valve to fail?
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.)