Nevada CDL — Air Brakes Practice Test 9

1.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

2.On a newer air-braked truck, what does the parking brake control look like, and how do you set the brakes with it?

A round blue knob; push it in to set the brakesA red, eight-sided knob; give it a quarter turn to set the brakesA yellow, diamond-shaped knob; push it in to set the brakesA yellow, diamond-shaped knob; pull it out to set the brakes

3.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

4.Which of these describes the stab braking method for an emergency stop?

Brake as hard as you can short of locking the wheels, keeping steering movements smallTap the pedal lightly and rapidly so the wheels never come close to lockingSet the parking brake first, then steer for the shoulderBrake fully, let off when the wheels lock, and brake fully again once they start rolling

5.Which kind of air tank drain requires you to empty the tank yourself after every driving day?

A manually operated drainAn automatic drainAn automatic drain fitted with an electric heaterNone; every tank drains itself while you drive

6.You have to brake hard on a slippery road in a truck with working ABS. Which result can you reasonably expect ABS to help with?

Stopping in about half the usual distanceBraking with more force than your normal brakes could giveKeeping the brakes working after the air pressure is goneAvoiding a skid caused by braking too hard

7.During your pre-trip leakage test, the air pressure falls faster than the allowed rate. What does the manual say to do, and why?

Drive gently to the next shop, since leaks only matter under hard brakingFind and fix the leaks before driving, or you could lose your brakes on the roadDrain the air tanks and run the test again until it passesRaise the governor cut-out pressure to make up for the leak

8.What is the final step in the Nevada manual's suggested sequence for checking your air brakes?

Drain each air tank until it is emptyHold the foot valve down for one more minuteCheck that the parking brake works before moving the vehicleRestart the engine and let pressure build to 55 psi

9.Which sequence matches the manual's service brake test for an air-braked vehicle?

Set the parking brake, raise the engine speed, and press the pedal lightly to see if the vehicle creepsLet pressure build to normal, release the parking brake, creep ahead at about 5 mph, and brake firmly with the pedalReach highway speed, then brake as hard as possible to see whether the wheels lockShut off the engine, release the parking brake, and pump the pedal until the warning comes on

10.A tractor in your fleet was built in 1995, before air-braked truck tractors were required to have ABS. What does the manual say about vehicles like this?

It may still have ABS, because many older vehicles were fitted with it voluntarilyIt cannot have ABS, because the systems did not exist before 1997It must be retrofitted with ABS before it may be driven againIt must show a red dash lamp to warn that ABS is missing