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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 Indiana CDL knowledge test. The IN 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 Indiana CDL Manual. Take this IN CDL practice test now to prepare for the actual air brakes test!
1.
In vehicles with air brakes, the brake pedal:
let the
air out of the spring brakes.
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tells you how much pressure is in
the air tanks.
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pumps air into the air storage
tanks.
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controls the air pressure applied to the brakes.
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2.
To brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary, you can use:
the "controlled braking" method or the "stab braking" method.
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the "controlled braking" method.
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the "stab braking" method.
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None of the above.
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3.
If your trailer starts to skid, you should:
accelerate slightly.
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keep the rear of your vehicle close to the curb.
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use the trailer hand brake (if you have one) to straighten out the rig.
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release the brakes to get traction back.
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4.
With air brake vehicles, you should use the parking brakes:
as little as possible.
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only if your vehicle is equipped with ABS.
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only during the vehicle inspection test.
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whenever you leave the vehicle unattended.
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5.
If your vehicle is hydroplaning, you should:
use the brakes to slow down.
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release the accelerator and push in the clutch.
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accelerate to get through the water as quickly as possible.
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None of the above.
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6.
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:
1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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7.
You should drain the air tanks completely. If water and oil collect in the air tanks:
your brakes could heat up.
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your brakes could become hard to press.
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your brakes could fail.
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None of the above.
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8.
ABS:
should only be used on dry roads.
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is an addition to your normal brakes.
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allows you to brake harder.
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replaces your normal brakes.
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9.
Emergency brakes must be held on by:
hydraulic pressure.
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dynamic pressure.
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air pressure.
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mechanical force.
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10.
The heavier the vehicle:
the less work the brakes must do to stop it.
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the more work the brakes must do to stop it.
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the higher the center of gravity will be.
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None of the above.
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