Arizona CDL: Pre-Trip Inspection Practice Test

Not quite. The answer is Turn signals

There are five dashboard indicators that you should ensure are working correctly: the left turn signal, the right turn signal, the four-way emergency flashers, the high beams, and the indicator for the antilock braking system (if your vehicle is so equipped).

Not quite. The answer is Brake chamber

The brake chamber (one at each wheel) converts air pressure to mechanical force to operate the brake at that wheel. When you press the brake pedal, compressed air from a service tank enters the brake chamber. Air pressure pushes out the brake chamber's pushrod, which moves the slack adjuster. The moving slack adjuster applies the brake.

Not quite. The answer is Heater/defroster

The heater/defroster provides a stream of warmed air. By selecting the appropriate vents, you can choose whether the air will heat the cab or melt frost on the windshield.

Not quite. The answer is Rim

The rim is the outer part of the wheel, to which a tire is attached. A damaged rim can result in loss of the tire from the rim, loss of the wheel from the axle, loss of air pressure in the tire, or the wheel rolling off the rim because of damage to the flange. During your pre-trip inspection, check that the rim is undamaged and the flange isn't bent. Check that no welding repairs have been made to the rim. Finally, check that there are no rust trails (which might indicate that the rim is loose on the wheel).

Not quite. The answer is air lines and electrical lines

During your pre-trip inspection, check the electrical lines and air hoses (or hydraulic hoses for hydraulic brakes). Make sure that the lines and hoses are not cut, chafed, spliced, or worn. Also make sure they are not tangled, pinched, or dragging on parts of the tractor.

Not quite. The answer is Parking brake

The parking brake keeps your vehicle from moving when it's parked. The mechanism is separate from the service brakes that you use in normal driving.

Not quite. The answer is In your pocket

While you are performing the pre-trip inspection, you do not want someone (such as a co-driver) who is unaware of your location to start your vehicle and accidentally injure you. Make sure you have the ignition key with you as you perform the inspection.

Not quite. The answer is the trailer parking brake

Even after you release the truck or tractor parking brake, the trailer parking brake should still hold your vehicle in place when you try to pull forward gently.

Not quite. The answer is Splash guards

Splash guards (mud flaps) behind the tires prevent debris from hitting other vehicles. During your pre-trip inspection, check that splash guards are present, undamaged, securely mounted, and not dragging on the ground or rubbing on the tires.

Not quite. The answer is the parking brake

The parking brake is meant to keep your vehicle from moving. The best way to test it is to apply the brake and then try to pull forward gently. The parking brake should hold your vehicle in place.

Not quite. The answer is If it's a cab-over vehicle

In a conventional vehicle, the engine is mounted forward of the driver. In a cab-over vehicle (also known as a cab-forward vehicle), the cab is located above, or even in front of, the front axle. To inspect a cab-over vehicle, it may be necessary for you to tilt the cab to gain access to the engine compartment. Before doing this, secure any loose items inside the cab so they won't fall when you tilt the cab.

Not quite. The answer is Check the sight glass.

Your vehicle may provide a way for you to check the coolant level even when the engine is hot. Such devices include reservoir sight glasses, see-through coolant overflow containers, and coolant recovery containers.

Not quite. The answer is the parking brakes

Test the parking brakes first. Then to test the service brakes, start by releasing the parking brakes.

Not quite. The answer is Clutch and gearshift

To ensure that your vehicle doesn't move once you start the engine, first depress the clutch (unless the vehicle has an automatic transmission) and put the gearshift in neutral (or Park for an automatic transmission). Once the engine has started, slowly release the clutch.

Not quite. The answer is Oil level

Use the dipstick to check the oil level in the engine. If the oil level is below the refill mark, add oil before you start to drive.

Not quite. The answer is Shock absorbers

During your pre-trip inspection, check the shock absorbers on every axle of your vehicle (including the trailers if any) to be sure that they are securely mounted and not leaking.

Not quite. The answer is Every axle

Be prepared to perform a brake components inspection on every axle. You may need to perform a suspension components inspection on every axle, too.

Not quite. The answer is Stop arm

The stop arm is an extensible stop sign on the side of the school bus. A control lets you swing out the stop arm to warn other drivers that you're stopping to pick up or let off passengers. During your inspection, check that the stop arm is undamaged and mounted securely on the vehicle frame, and there are no loose fittings. Activate the stop arm to be sure that it extends fully.

Not quite. The answer is Poisonous fumes can enter the cab or sleeping compartment.

The exhaust system is designed to help remove toxic gases produced by the engine. A leak in the exhaust system can allow poisonous carbon monoxide (CO) to seep into the cab or sleeping compartment. A buildup of CO is more likely in cold weather, when you may have the cab windows closed.

Not quite. The answer is Landing gear

The trailer landing gear is a set of retractable legs that support the trailer when it is parked. During your pre-trip inspection, check that the landing gear is fully raised and no parts are missing. Check that the crank handle is secure and the support frame is undamaged. If the landing gear is power operated, check it for air or hydraulic leaks.