InspectionPregunta 31 de 60
How do you perform the static leakage (applied pressure) test on a straight truck with air brakes?
a.With a fully charged system, release the brakes, turn off the engine, apply full brake pressure, and watch that the drop does not exceed the allowed limit
b.Drain the tanks and check that they refill on their own
c.Drive at 20 mph and slam on the brakes
d.Disconnect the trailer and check the gladhands
Explicación
With the air system fully charged (about 125 psi), turn off the engine, release the parking brake, and hold the brake pedal down (fully applied). After the initial pressure drop stabilizes, the air pressure should not drop more than 3 psi in one minute for a straight truck (4 psi for a combination). A greater loss means there is a leak that must be repaired.
Practica las 60 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- What is the correct way to begin the air brake check for build-up rate in a dual air system?
- How do you test the low-pressure warning signal?
- At what pressure should the spring brakes come on automatically during the continued-air-loss test?
- For a single vehicle (straight truck), what is the maximum allowable air pressure loss in one minute with the brakes applied?
- With the engine off and brakes released, what is the maximum allowable air leakage per minute for a straight truck?
- How should you test that the service brakes are working before driving?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con CDL Air Brakes Knowledge Test · Cómo revisamos