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SD CDL AIR BRAKES PRACTICE TEST

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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 South Dakota CDL knowledge test. The SD 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 South Dakota CDL Manual. Take this SD CDL practice test now to prepare for the actual air brakes test!
1. Before starting down a hill, you should:
slow down and shift to a lower gear.
apply the brakes hard.
release the accelerator and shift to Neutral at the same time.
look for an escape route.
2. If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
5 seconds
2 seconds
4 seconds
3 seconds
3. Tar in the road pavement rising to the road surface in very hot weather:
causes the road to become very slippery.
might get in your engine.
does not affect the road surface or driving conditions.
is very sticky and will slow down your vehicle.
4. If your vehicle catches fire, you should pull over:
in an open area.
near trees.
at a service station.
near other vehicles.
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.
All of the above.
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.
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
7. The Johnson bar is a valve that:
keeps air from going out if the air compressor develops a leak.
is installed in the first tank the air compressor pumps air to.
reduces the braking pressure to a safe level.
works the trailer brakes.
8. When the wheels of a trailer lock up:
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
All of the above.
9. During a trip you should check:
mirrors.
temperature gauges.
pressure gauges.
All of the above.
10. If air doesn't flow all the way to the back:
a rollover is more likely.
the trailer will tend to swing around.
your brakes will not work properly.
your lower fifth wheel may fall off.
 
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SD CDL Air Brakes Test

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