Commercial Drivers' License (CDL) Information
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Air Brakes Sample Test F

1. When you apply pressure to the brake pedal, you are:
A Pushing against a spring and against air pressure to the brakes
B Releasing air pressure to the brakes
C Reducing air in the tanks
D Activating the safety valve

2. Brake drums:
A Are bolted to the wheels
B Are located at each end of the vehicle's axles
C Hold the brake shoes and linings
D All of the above

3. Which type of brake is the most common in commercial vehicles?
A Wedge brakes
B Disk brakes
C S Cam brakes
D Drum brakes

4. An air pressure gauge:
A Shows how much pressure you are applying to the brakes
B Is connected to the generator
C Releases air when you accelerate
D Prevents brake failure

5. All vehicles with air bakes are required to have a low pressure warning signal. This could be:
A A red light
B A wig wag mechanical arm
C A buzzer
D Any one of the above

6. When the low pressure warning is activated, you should:
A Wait for the air brakes to come on automatically
B Bring the vehicle to a safe stop while you still control the brakes
C Monitor your air pressure gauge and maintain highway speeds
D Pump the brake pedal hard to stop

7. A duel air brake system:
A Has two air brake systems and one set of controls
B Takes less time to build air pressure
C Has one set of air tanks and hoses
D Must have two warning alarms

8. An emergency brake:
A Is required on commercial vehicles
B Must be held on by mechanical force
C Could be activated by the loss of air pressure
D All of the above

9. To check the slack adjusters on S Cam brakes, you should:
A Leave the parking brakes on and pull on the slack adjuster
B Wear gloves and pull hard on each slack adjuster
C Make sure the slack adjusters move more than one inch each way
D Drain the air from the system and pull on the slack adjusters

10. To test the low pressure warning signal, you should do all BUT the following:
A Shut the engine off
B Turn the electrical power on
C Ask a friend to listen for the signal
D Step on and off the brake pedal to reduce air pressure

Score =
Correct answers:






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