Nevada CDL — Air Brakes Practice Test 2

11.The first part of the air brake check on the CDL vehicle inspection test is the air gauge and governor cut-off check. What does it involve?

Chocking the wheels, starting the vehicle, confirming the gauge works as pressure rises to cut-off, and naming your vehicle's cut-off pressureHolding the foot brake down for one minute with the engine offFanning the brake pedal until the low air warning devices activatePulling gently against the parking brake in a low gear

12.The low air warning comes on, and you are tempted to keep driving until the spring brakes stop you. Which of these is NOT a reason the manual gives for stopping right away instead?

A heavily loaded vehicle needs a long way to stop on spring brakes, since they don't act on every axleA lightly loaded vehicle, or one on a slick road, could go into an uncontrolled skid once the spring brakes applySpring brakes let go by themselves after a few seconds, so the vehicle will start rolling againYou can control your braking with the pedal only while enough air is left in the tanks

13.Your truck's low air warning is an automatic wig wag, and its arm has dropped into view. Once the compressor brings system pressure back above 55 psi, what does the arm do?

It stays down until a mechanic resets itIt stays down until the engine is shut off and restartedIt must be pushed up by hand before it will clearIt rises back out of view by itself

14.You open the valve on a manually drained air tank at the end of the day. How much should you let out?

Only a quick burst, so you don't lose any working pressureJust enough to hear air escaping, then close the valveNone while the tank is cold; wait until the next morningDrain the tank completely so the water and oil are removed

15.How does the manual have you fit the extra air brake items into a pre-trip inspection?

Skip the seven-step inspection and do only the air brake checksFinish the seven steps, then do every air brake item as a separate eighth stepDo the regular seven-step inspection and add each air brake check in the step where it belongsDo the air brake checks only when the low air warning has come on

16.Of the gauges that report on an air brake system, which one is found on every vehicle with air brakes?

The application pressure gaugeA supply pressure gauge linked to the air tankA brake drum temperature gaugeA slack adjuster stroke gauge

17.Brakes are built to absorb a lot of heat. On a long downgrade, what does the manual say pushes them into fading or failing?

Using them too much instead of relying on engine brakingDraining the air tanks before the tripDriving in too low a gearBraking in short, firm applications

18.In the Nevada manual's suggested air brake check, you keep pumping the foot brake to bring pressure down toward roughly 20 to 40 psi. What are you watching for at that stage?

The governor cutting the compressor back inThe tractor protection valve and parking brake knob popping outThe low air warning light switching offThe safety relief valve venting air

19.You switch from a fleet truck with two air storage tanks to one that has three larger tanks. What does the manual say about a difference like this?

It is normal; the number and size of air tanks vary from vehicle to vehicleEvery air-braked vehicle must carry exactly two tanks of equal sizeA truck with three tanks does not need an air compressorLarger tanks never collect water, so they never need draining

20.Some buses have dual parking control valves fed by a separate air tank. What is that separate tank there to do?

Keep the service brakes working normally after main air is lostRelease the spring brakes so the bus can be moved in an emergency after main air is lostSupply air to the horn and wipers when the compressor stopsRefill the main tanks when the governor fails