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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Oregon CDL knowledge test. The OR CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Oregon CDL Manual. Take this OR CDL practice test now to prepare for the actual air brakes test!
1. When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
2 psi in one minute.
4 psi in one minute.
2 psi in 30 seconds.
3 psi in one minute.
2. With brake drums, if brakes become too hot:
the brakes will supply too much power to the drive wheels.
The brakes may stop working
the air compressor will kick on to cool the brakes.
your ABS will malfunction.
3. Front brake limiting valves were used to:
reduce the chance of the front wheels skidding on slippery surfaces.
reduce exhaust emissions.
prevent overheating of the front tires.
reduce your speed so further braking or shifting is not required.
4. An anti-lock braking system (ABS):
should help you steer around an obstacle while braking.
helps you avoid skids caused by over braking.
helps you avoid wheel lock up.
All of the above.
5. Front wheel braking is good:
under all conditions.
only in good weather.
only in wet conditions.
Never.
6. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
3, 15 and 45 feet
10, 100 and 200 feet
5, 25 and 50 feet
5, 50 and 500 feet
7. ABS:
makes it easier to break.
helps you avoid wheel lock up.
makes it easier to turn.
allows the wheels to lock up.
8. To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
9. ABS:
should only be used on dry roads.
is an addition to your normal brakes.
replaces your normal brakes.
allows you to brake harder.
10. When driving in a construction zone, if a construction worker is near the road, you should:
further reduce your speed.
speed up.
come to a complete stop.
maintain a constant speed.
 
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OR Air Brakes CDL Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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