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CDL Air Brakes Study Guide #3
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What is a dual air brake system?
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1 point
A two brake system, one operates the front brakes and one operates the back brakes
A two brake system, one for each side of the vehicle
A two brake system, one for daytime and one for nighttime driving
You are on a steep downgrade and have reached your safe speed of 40 mph. You would apply the service brakes until your speed drops to ___ mph.
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25
35
30
The emergency brake system:
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Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure
Uses the service brake to stop the vehicle in the event of a brake system failure
The use of air brakes on a downgrade is only a supplement to the:
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Use of the spring brakes
Use of the front brake limiting valve
Braking effect of the engine
The air supply pressure gauge shows how much pressure:
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Is in the air tanks
You have used in this trip
Is going to the brake chambers
Which of these is the most important thing to remember about emergency braking?
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Disconnecting the steering axle brakes will help keep your vehicle in a straight line during emergency braking
Never do it without downshifting first
If the wheels are skidding, you cannot control the vehicle
The parking brake applies and releases:
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The brake pedal during normal driving
In the event of an emergency
The parking brakes when you use the parking brake control
The service brake applies and releases:
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The parking brake when you use the parking brake control
The brake when you use the brake pedal during normal driving
In the event of an emergency
Controlled braking:
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Involves locking the wheels for short periods of time
Can be used while you are turning sharply
Is used to keep a vehicle in a straight line when braking
When you put the brakes on by pushing down on the brake pedal,
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Compressed air is let go out of the system
The air pressure is reduced to the brake pads
Air pressure is applied to the brake pads
To correct a drive-wheel braking skid, you should:
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Increase braking
Stop braking, turn quickly, and countersteer
Increase braking, turn quickly, and countersteer
The air loss rate for a straight truck or bus with the engine off and brakes on should not be more than:
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1 PSI in one minute
2 PSI in 45 seconds
3 PSI in one minute
When the air pressure falls to the minimum pressure allowed in the system, the governor prevents more air from escaping the air tanks.
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True
False
The governor controls when the air compressor will pump into the air storage tanks.
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True
False
If your bus or truck has dual parking control valves, you can use pressure from a separate tank to:
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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
The storage tanks are used to hold compressed air.
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True
False
Excessive heat in the brakes can cause the:
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Modulating control valve to wear out
Brake lines to plug
Brakes to fade or fail
The parking or emergency brakes of trucks or buses can legally be held on by ___ pressure.
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Spring
Fluid
Air
Air brake equipped vehicles have:
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An air use gauge
An air supply pressure gauge
A backup hydraulic system
How do you test the hydraulic brakes for leaks?
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Drive slowly and pump the brake pedal. Make sure it doesn’t hit the floor
Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move
Drive 20 mph and slam on the brakes
The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the S-cam because:
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It is shaped like the letter “Z”
It is shaped like the letter “N”
It is shaped like the letter “S”
The stop light switch:
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Turns on the brake lights to warn drivers behind you
Tells you when you need to use your emergency brakes
Tells you when the air brake system is low on air pressure
With air brake vehicles, the parking brakes should be used:
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Whenever you leave the vehicle unattended
As little as possible
Only during pre-trip and post-trip inspections
Modern air brake systems are three different systems combined together. They are the service, parking, and the ___ brakes.
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Emergency
Foot
S-cam
Converter dollies built on or after March 1, 1998, are required to have anti-lock brakes. These dollies have:
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A yellow malfunction lamp in the center of the dolly
A yellow malfunction lamp on the right side of the dolly
A yellow malfunction lamp on the left side of the dolly
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