Delaware CDL — Air Brakes Practice Test 1

11.Step 2 of the inspection adds one air brake item when the compressor runs off a belt. What do you look at?

Only that a belt is presentThat it is loose enough to slip under loadIts condition and how tight it isThat it was replaced within the last month

12.Your truck has a dual air brake system. How will its supply pressure gauges be arranged?

One gauge with a single needle showing the average of both systemsA separate gauge at every wheelEither one gauge for each side of the system or a lone gauge with two needlesNo gauge at all, only a warning light

13.For the air leakage rate test on Delaware's inspection test, you shut off the engine. What do you do with the key next?

Remove it from the ignitionHold it in the 'start' positionHand it to the examinerTurn it back to 'on' or 'battery charge'

14.On a vehicle with air brakes, what takes the place of the hydraulic brake check in Step 7 of the seven-step inspection?

The final air brake check laid out in the Air Brakes sectionNothing; Step 7 is skipped on air-braked vehiclesA second walk-around inspectionA repeat of the engine compartment check

15.Which of these is NOT one of the four parts of the air brake check on Delaware's CDL vehicle inspection test?

The air gauge and governor cutoff checkThe air leakage rate testA brake drum temperature testThe air warning device test

16.Once you are in the right low gear on a long downgrade, how hard does the manual say to press the brakes each time you apply them?

As hard as possible, until the wheels lockSo lightly that your speed does not changeFirmly enough that you can clearly feel the vehicle slowingWith full pressure, held all the way to the bottom

17.During the emergency brake test on Delaware's inspection test, your vehicle has valves that do not pop out by design. How do you tell that the parking or emergency brakes have applied?

Watch for the ABS lamp to lightWait for the low air buzzer to go quietCheck that the governor cuts inListen for air discharging from the air system

18.A modulating control valve lets the driver bring the spring brakes on gradually. Why does the manual say it works that way?

It gives the driver a controllable way to stop with the spring brakes after a service brake failureIt lets the parking brakes be set without using any airIt gives the compressor time to cut inIt makes the trailer brakes apply ahead of the tractor brakes

19.You begin the air leakage rate test with the system fully charged and the engine off. What do you do with the parking brake?

Set it by pulling the control outLeave it in whatever position it was inRelease it by pushing the control inApply and release it several times

20.You are about to troubleshoot a brake adjustment problem on a vehicle with automatic slack adjusters. What does the manual say to consult first?

Another driver, since all automatic adjusters work alikeThe vehicle's registration papersThat manufacturer's service manual, since adjusters from different makers do not all work alikeThe ABS section of the CDL manual