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24 Cards in this Set

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1. What factors can cause brakes to fade or fail?

A. Brakes can fade or fail from excessive heat caused by using them too much. B. Brakes that are out of adjustment. A and B.

2. You should break the same way, regardless of whether you have ABS on the tractor, the trailer, or both.

True.

3. The emergency brake system applies and releases the brakes when you use the brake pedal during normal driving.

False.

4. All trucks, tractors, and buses must be equipped with emergency brakes and parking brakes.

True.

5. Front wheel brakes are good under all conditions.

True.
6. The service brake system applies and releases the parking brakes when you use the parking brake control.

False.

7. Pressing and releasing the brake pedal unnecessarily will never let air out faster than the compressor can replace it.
False.
8. Pumping by the air compressor should start at about ____ psi and stop at about ____ psi.
100 and 125.
9. 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.
10. The air pressure should not drop more than ____________ in one minute during a Static Leakage Test.
2 psi for single, 3 psi for a combination, and 5 psi for a combination of three or more vehicles.
11. 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 braking effect.
12. Damaging the brakes by pushing down the brake pedal while the spring brakes are on is a myth.
False.
13. Having ABS brakes only on the tractor or only on the trailer or even just on one axle still gives you more control over the vehicle during braking.
True.
14. The air tanks hold enough air to allow the brakes to be used a maximum of 3 times.
False.
15. If you are away from your vehicle only a short time, you don't need to use the parking brake.
False.
16. What is a slack adjuster?
A lever, connecting the brake chamber push rod with the foundation brake camshaft.
17. The safety valve in an air tank is usually set to open and release air at 200 psi.
False.
18. Wait for normal air pressure, release the parking brake, move the vehicle forward slowly and then apply the brakes firmly using the brake pedal best describes?
Testing the service brake.
19. What is a dual air brake system?
A dual air brake system has two separate air brake systems which use a single set of brake controls. A dual air brake system has two separate air brake systems, the first system is called the primary system. The other is called the secondary system. A dual air brake system has two separate air brake systems, each system has its own air tanks, hoses, lines, etc. A dual air brake system has two separate air brake systems, both systems supply air to the trailer if there is one. When air tank pressure rises to around 150 psi, the governor stops the compressor
20. from pumping air.
False.
21. 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.
22. The air pressure should not drop more than ____________ in one minute during an Applied Leakage Test.
3 psi for single, 4 psi for a combination, and 6 psi for a combination of three or more vehicles.
23. 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.

24. When air tank pressure rises to around 125-130 psi, the governor stops the compressor from pumping air.

False.