Air Brakes Flashcards
TRUE or FALSE The use of brakes on a long steep downgrade is only a supplement to the braking effect of the engine
TRUE
How often should drain air tanks?
Drain your air tanks at the end of each working day
What is a supply pressure gauge used for?
The gauges tell you how much pressure is in the air tanks
How can you check slack adjusters?
By pulling hard on each slack adjuster.
What are the maximum leakage rates for an air brake system?
The loss rate should be less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.
Why must air tanks be drained?
To keep oil and water from building up in the tank.
TRUE or FALSE all vehicles with air brakes must have a low air pressure warning signal
TRUE
What factors can cause brakes to fade or fail?
- brakes can fade or fail from excessive heat caused by using them too much
- brakes that are out of adjustment
TRUE or FALSE Front wheel brakes are good under all conditions?
TRUE
What are spring brakes?
Powerful springs that are held back by air pressure. If the air pressure is removed, the springs put on the brakes.
Why should you be in the proper gear before starting down a hill?
Brakes can fade or fail from excessive heat caused by using them too much and not relying on the engine break effect.
TRUE or FALSE if you are away from your vehicle only a short time, you don’t need to use the parking brake?
FALSE
What are the slack adjusters?
A lever connecting the brake chamber push rod with the foundation brake camshaft
What is a dual air brake system?
A dual air break system has two separate air brake systems, the first system is called primary and the other secondary
How can you check that the spring brakes will come on automatically?
Step on and off the brake pedal to reduce the air tank pressure, the parking brake knob should pop out when the air pressure falls to the manufacturers specification
How can you test the low pressure warning signal?
Turn the electrical power on and step on and off the brake pedal to reduce air tank pressure. The low air pressure warning signal must come on before the pressure drops to less than 60 psi in the air tank
Modern air brake systems combine three different systems. They are the service brakes, the parking brakes and the:
Emergency brakes
Oil and water usually collect in compressed air tanks. If you do not have automatic tank drain, when should you drain the air tanks?
After every working day