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📖 Air Brakes Test
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31
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
Bring the vehicle to a safe stop and safely park. Continue only after the system is fixed. ✓ CORRECT
Reduce your speed, and test the remaining system while under way.
Reduce your speed and drive to the nearest garage for repairs.
32
The brake pedal in an air brake system:
Control the speed of the air compressor.
Control the air pressure applied to put on the brakes. ✓ CORRECT
Is connected to slack adjusters by a series of rods and linkages.
33
The S-cam:
Controls the flow air to each of the brake chambers.
Pulls the brake shoes away from the drum and allow the wheels to roll freely.
Forces the brake shoes against the inside of the brake drum. ✓ CORRECT
34
Under normal conditions in order to engage the parking brakes, driver:
Turn off the engine.
Let the air out of air brake system. ✓ CORRECT
Be sure air brakes systems is fully pressurized.
35
All air brake equipped vehicles have:
A supply pressure gauge. ✓ CORRECT
An air usage gauge.
A backup hydraulic system.
36
With air brake vehicles, the parking brakes should be used:
Whenever you leave the vehicle unattended ✓ CORRECT
As little as possible.
Only during pre-and post-trip inspections.
37
A straight truck or bus air brake system should not leak at the rate of more than ____ psi per minute with the engine off and the brakes released.
1.
3.
2. ✓ CORRECT
38
Which of these is NOT a proper time to apply the parking brakes?
To brake vehicle very hard, in other word when coming down the steep grade. ✓ CORRECT
To use parking brakes if you park for less than 1 hour.
If you are going to use the parking brakes you need to make sure that they will hold the vehicle.
39
Which air brake vehicles, the parking brakes should be used:
As little as possible.
Anytime when the vehicle is parked. ✓ CORRECT
To hold your speed when going downhill.
40
Which air brake vehicles, the parking brakes should be used:
As little as possible.
Anytime when the vehicle is parked. ✓ CORRECT
To hold your speed when going downhill.