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Air Brakes Quiz
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.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
(Required)
Balance the service brake system when you are parked.
Stay parked twice as long without using up service air pressure.
Release the spring emergency/parking brakes to move a short distance.
If your vehicle has an alcohol evaporator, every day during cold weather you should:
(Required)
Check and fill the alcohol level.
Check the oil for alcohol content.
Change the alcohol from a new bottle.
During normal driving, spring brakes are usually held back by:
(Required)
Air pressure
Spring Pressure
Bolts or Clamps
The application pressure gauge shows how much air pressure you:
(Required)
Are applying to the brakes.
Have in the air tanks.
Have in a modulating control valve.
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
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)
2
3
1
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)
50
60
80
Parking or emergency brakes of trucks and buses can be legally held on by __________ pressure.
(Required)
Fluid
Spring
Air
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 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 test the remaining system while under way.
Reduce your speed and drive to the nearest garage for repairs.
The safety valve is set automatically when pressure is:
(Required)
100
50
150
Your truck has a dual air system and one of the system loses its pressure. What will happen?
(Required)
Either the front or back brake will not be fully operational.
Brake drums will not be fully pressurized.
The manual slack adjusters of the S-cam brakes will not be set properly.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
(Required)
1 psi in 30 seconds.
2 psi in 45 seconds.
3 psi in one minute.
If you must make an emergency stop, you should brake so you:
(Required)
Use the full power of the brakes to lock them.
Use the hand brake before the brake pedal.
Can steer and so your vehicle stays in a straight line.
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)
60
30
45
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
Excessive use of the service brakes results in overhearing which can lead to:
(Required)
Proper adjustment of S-cam.
Expansion of the brake drums.
Increase contact between the brake drums and linings.
The air compressor stops pumping air at what psi?
(Required)
150
100
125
The most common type of foundation brake found on heavy vehicles is the:
(Required)
Disc
Wedge Drum
S-Cam Drum
How should you check that your service brakes are working properly?
(Required)
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 slight grade, drain off air pressure, set parking brake and check the movement.
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.
Why drain water from compressed air tanks?
(Required)
Water can freeze in cold weather and cause brake failure.
Water low boiling point reduces braking power.
Water cools the compressor too much.
The braking power of the spring brakes:
(Required)
Depends on the service brakes being in adjustment.
Is not affected by the condition of the service brakes.
Increases when the service brakes are hot.
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