Air Brake Manual Chapter 7
Air Brake Safety Quiz
Test your knowledge on air brake systems and ensure your safety on the road. This quiz covers essential information found in the Air Brake Manual Chapter 7. Whether you're a driver, mechanic, or just interested in learning more, this quiz will help reinforce important concepts.
- Understand brake adjustments and their impact on safety.
- Learn about the role of slack adjusters.
- Evaluate your knowledge on pre-trip inspections and maintenance checks.
What is the most common cause of loss of braking?
Driver error
Poor brake adjustment
Adverse weather conditions
Low air pressure
A correctly adjusted brake will have what range of slack?
2 1/2 in. to 4 in.
0 in. to 1/2 in.
1/2 in. to 3/4 in.
3/4 in. to 1 in.
Brakes must be adjusted when slack reaches 1/2 in.
True
False
Under normal/light braking conditions even grossly maladjusted brakes seem to respond satisfactorily.
True
False
What is the function of the slack adjusters?
A device on the brake chamber used to manually release the spring brakes
Manually or automatically maintain proper brake chamber stroke and lining-to-drum clearance
Used to supply air to the trailer
A rotating S-shaped cam which activates the brake shoes
How often should automatic slack adjusters be checked?
Daily
Twice daily
Once per week
When required by the carrier
The most efficient braking occurs when push rod travel is held to a ...
Maximum
Minimum
Median
Mean
Which is not an effective service test of your brakes?
Applying the brakes to check the movement of the slack adjusters
Releasing the brakes the check the movement of the slack adjusters
Checking the angle of the slack adjusters in both the applied and released brake position
A verbal explaination of the proper procedure for adjusting your slack adjuster
Who is ultimately responsible for the safe adjustment of vehicle brakes?
The carrier company
The insurance company
The mechanic who adjusted them
The driver
After two inches of push rod stroke, its force increases rapidly.
True
False
What is the cut-out pressure for the governor operation?
120 to 145 psi
100 psi
80 psi
10 to 20 psi
During a pre-trip procedure for an air single or combination unit, what is the maximum time permitted for the compressor to build from 85 to 100 psi?
5 minutes
2 minutes
30 seconds
10 seconds
What is the maximum air loss permitted after an initial foot-brake application on a combination unit?
1 psi in 1 minute
15 psi in 1 minute
4 psi in 1 minute
20 psi in 1 minutes
What is the maximum air loss permitted after an initial foot-brake application on a single unit?
20 psi in 1 minutes
1 psi in 1 minute
4 psi in 1 minute
15 psi in 1 minute
What is the final brake test that should be made before the vehicle is put into service?
Emergency-brake test
Park-brake test
Foot-brake test
Visual inspection
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