Tennessee CDL — Air Brakes Practice Test 8

11.What is "controlled braking" during an emergency stop?

Slamming the brakes fully and holding them lockedBraking as hard as possible without letting the wheels lock, using tiny steering inputsPumping the pedal rapidly regardless of wheel lockBraking only with the parking brake control

12.Where is the yellow ABS malfunction lamp located on a trailer?

On the right rear bumperOn the left side, at a front or rear cornerOn the instrument panel inside the cabOn the underside of the fifth wheel

13.How often must you empty a manually operated air tank drain valve?

Once a week during warm monthsOnly when the low pressure warning comes onAt the close of each driving dayEvery time you refuel

14.On the application pressure gauge, needing more and more pressure to hold the same speed is a sign of what, and what should you do?

The tanks are overfilled, so pump the pedal to release airThe governor has failed, so speed up to reset itThe alcohol level is low, so refill the evaporatorThe brakes are fading, so slow down and use a lower gear

15.What does the manual say about front wheel braking under slippery conditions?

Front brakes should be turned off on wet roadsFront brakes always skid first on slippery pavementFront wheel braking is good in all conditions and rarely causes a skid, even on iceFront brakes work only above 55 psi

16.How do you test the service brakes as part of the final check?

Roll ahead at roughly five mph, then press the brakes hard, noting any pulling or delayBrake hard from highway speed to lock the wheelsHold the pedal down for a full minute while parkedCoast in neutral without touching the pedal

17.What is the job of the air compressor in an air brake system?

It drains moisture out of the storage tanksIt pumps air into the storage tanks so pressure is availableIt measures how much pressure is being applied to the brakesIt releases the spring brakes when you park

18.As soon as the low-pressure warning light and its buzzer come on, what is the correct action?

Keep driving until the spring brakes apply by themselvesBring the vehicle to a safe stop while you can still control the brakesPump the pedal quickly to rebuild pressureIgnore it until the gauge reads zero

19.On a long, steep downgrade, the braking effect of the service brakes should be treated as what?

The only thing you need to control speedOnly a supplement to the engine's braking effectA replacement for gearing downSomething to avoid using entirely on hills

20.With the engine off and the foot brake fully applied, what air loss rate is acceptable for a single vehicle over one minute?

No more than six psi in one minuteNo more than ten psi in one minuteAny drop is acceptable if the warning stays offNo more than three psi in one minute