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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 Rhode Island CDL knowledge test. The RI 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 Rhode Island CDL Manual. Take this RI CDL practice test now to prepare for the actual air brakes test!
1. Before starting down a hill, you should slow down and shift down:
to a gear that will cause your engine to exceed its redline.
to a speed that you can control without using the brakes hard.
so you can coast downhill.
2. With the controlled braking method, you:
apply the brakes all the way and release brakes when the wheels the lock up.
push down on the brake pedal as hard as you can so that the wheels the lock up.
apply the brakes as hard as you can without locking the wheels.
3. When you make a quick lane change, the crack-the-whip effect can:
make it harder to turn without skidding.
improve your traction.
turn the trailer over.
4. When you pull hard on a slack adjuster and it moves more than about _____ where the push rod attaches to it, the slack adjuster probably needs adjustment.
1/2 inch
2 inches
1 inch
5. The braking power of the spring brakes:
is not affected by the air pressure level.
depends on the brakes being in adjustment.
is not affected by the condition of the service brakes.
6. If your vehicle has an alcohol evaporator, every day during cold weather, you should:
fill it up with oil to prevent the pipes from freezing.
check the alcohol container and fill up as necessary.
fill it up with oil to prevent alcohol from freezing.
7. To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
put alcohol into the air system, run the engine at a fast idle
release the parking brake, leave the engine running
turn off the engine, release the parking brake
8. When backing a trailer, you should:
try to position your vehicle so you can back in a straight line.
turn the steering wheel in the direction you want to go.
avoid correcting the drift.
9. Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
helps keep the engine cool, as well as lubricating it.
helps you avoid wheel lock up.
reduces the risk of ice in air brake valves during cold weather.
10. An anti-lock braking system (ABS):
helps you avoid wheel lock up.
helps you avoid skids caused by over braking.
All of the above.
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RI CDL Air Brakes Test

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