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Air Brakes Quiz
If your vehicle has an alcohol evaporator, every day during cold weather you should:
(Required)
Check and fill the alcohol level.
Change the alcohol from a new bottle.
Check the oil for alcohol content.
Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of an alcohol?
(Required)
Ice may form in the air storage tank and cause a brake failure.
The S-cam may not take back when you release the brake pedal.
Ice may form on the brake drums and wear them out.
The braking power of the spring brakes:
(Required)
Increases when the service brakes are hot.
Depends on the service brakes being in adjustment.
Is not affected by the condition of the service brakes.
The air compressor stops pumping air at what psi?
(Required)
100
150
125
The safety valve is set automatically when pressure is:
(Required)
100
150
50
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi witihin how many seconds?
(Required)
30
45
60
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _________ psi.
(Required)
60
80
50
The application pressure gauge shows how much air pressure you:
(Required)
Are applying to the brakes.
Have in a modulating control valve.
Have in the air tanks.
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.
(Required)
1
2
3
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?
(Required)
Stop right away and safely park. Continue only after the system is fixed.
Reduce your speed and drive to the nearest garage for repairs.
Reduce your speed and test the remaining system while under way.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
(Required)
3 psi in one minute.
2 psi in 45 seconds.
1 psi in 30 seconds.
How should you check that your service brakes are working properly?
(Required)
Park on slight grade, drain off air pressure, set parking brake and check the movement.
Park on a level ground, chock the wheels, engage the parking brakes when you have the correct amount of air pressure to do so and shut the engine off.
Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.
Your truck or bus has a dual brake system. If a low air pressure warning comes on for only one system, what should you do?
(Required)
Reduce your speed and drive to the nearest garage for repairs.
Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed.
Reduce your speed and test the remaining system while under way.
Your truck has a dual air system and one of the system loses its pressure. What will happen?
(Required)
Brake drums will not be fully pressurized.
Either the front or back brake will not be fully operational.
The manual slack adjusters of the S-cam brakes will not be set properly.
If you must make an emergency stop, you should brake so you:
(Required)
Can steer and so your vehicle stays in a straight line.
Use the full power of the brakes to lock them.
Use the hand brake before the brake pedal.
Why drain water from compressed air tanks?
(Required)
Water can freeze in cold weather and cause brake failure.
Water cools the compressor too much.
Water low boiling point reduces braking power.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _________ psi.
(Required)
60
40
80
Parking or emergency brakes of trucks and buses can be legally held on by __________ pressure.
(Required)
Spring
Fluid
Air
Excessive use of the service brakes results in overhearing which can lead to:
(Required)
Expansion of the brake drums.
Increase contact between the brake drums and linings.
Proper adjustment of S-cam.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _______ psi.
(Required)
20
60
100
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
(Required)
Stay parked twice as long without using up service air pressure.
Release the spring emergency/parking brakes to move a short distance.
Balance the service brake system when you are parked.
During normal driving, spring brakes are usually held back by:
(Required)
Spring Pressure
Bolts or Clamps
Air pressure
The most common type of foundation brake found on heavy vehicles is the:
(Required)
Disc
S-Cam Drum
Wedge Drum
Name
(Required)
First
Last
Email
(Required)
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