Our printable Alabama CDL Air Brake worksheet will help you get 100% ready for your coming exam

With air brake-equipped vehicles, the parking brakes should be used ___________.

Because air pressure can leak when you're not in your vehicle, the parking brake should be used to keep it from rolling. This regulation has an exception: if the brakes are too hot or wet, use wheel chocks instead to prevent brake damage or freezing.

whenever you leave the vehicle unattended.

only during pre-trip and post-trip inspections.

Which of the following is NOT part of the air-brake system?

The service brake, parking brake, and emergency brake are the three independent systems that make up the air brakes. Read your handbook before the exam so you know what each button performs.

Why do you need to drain air tanks regularly?

Water and compressor oil are commonly included in compressed air in an air brake system. If water and oil are allowed to collect in the system, they can harm the brakes. To remove this build-up, tanks must be drained on a regular basis.

Because compressed air contains some water which must be drained from the tanks.

Because the air gets old and needs to be replaced.

How can you tell if your vehicle is equipped with an anti-lock braking system?

Anti-lock brakes are compulsory on all vehicles manufactured after 1998. A yellow ABS malfunction lamp will also be present.

During your final air brake check, if the air pressure does not build up fast enough, _____________.

Once the engine has attained normal operating speed, the manufacturer's requirements should stipulate how quickly the air pressure should build up. If the air pressure does not build up rapidly enough during your final air brake inspection, it may not replenish quickly enough during regular braking. Do not use the vehicle until the source of the problem has been identified and rectified.

the air pressure may drop too low during driving.

have the problem fixed after your trip is over.

Excessive heat created by overuse of the service brakes could lead to__________.

Excessive braking can damage the brake lining and reduce friction by causing the brake drums to separate from the shoes or pads. Brakes will weaken (lose their effectiveness). Use engine braking as opposed to the service brakes when climbing a long or steep hill.

the modulating control valve to wear out.

Brake linings should be <code>____</code>

Brake linings should not be loose or soaked with oil or grease. They shouldn't be dangerously thin.

The parking or emergency brakes on large, heavy vehicles must be held on by something that cannot leak away, such as <code>____</code>.

Federal safety regulations on buses and cars required parking and emergency brakes that do not rely on compressed air or hydraulic fluid (because these can leak away). As a result, the parking and emergency brakes employ mechanical force, such as springs.

You can test the air compressor governor by ____________.

When a lower air pressure is achieved, the air compressor governor should kick in, and when a greater air pressure is reached, it should kick out. (For these pressures, consult your manufacturer's instructions.) To test this, raise the air pressure by running the engine at a fast idle until the air compressor governor cuts out. Then, to lessen the air pressure, keep stepping on and off the brake pedal until the air compressor governor engages.

by increasing and decreasing the air pressure.

by using the air brakes and monitoring the pressure gauges while traveling less than 40 mph.

The two markings on a front brake limiting valve usually read _______________.

A front brake limiting valve with "normal" and "slippery" settings is seen on some vehicles with air brake systems built before 1975.

At what measurement is the safety valve USUALLY set to open?

When the system hits 150 psi, the safety valve, which protects the system from excessive pressure, is normally set to open.

If you do not have an automatic tank drain, when should you drain your air tanks?

If an air tank's bottom isn't evacuated, oil and water can begin to gather and cause failure. Unless your vehicle drains the air tanks automatically, you should drain them at the end of each working day to prevent moisture and oil from freezing and coagulating and causing brake failure.

The parking brake in a newer vehicle is applied by _________________.

The parking brake is operated by a yellow diamond-shaped knob in modern automobiles with air brakes. To apply the parking brakes, the driver should pull the knob outward, and to remove them, the driver should press the knob inward.

How do you adjust a manual slack adjuster?

Turn the adjustment nut to bring the slack adjuster's end toward the air chamber until the nut stops rotating to adjust a manual slack adjuster. The brake shoes should be pressed on the inside of the brake drum at this stage. Then turn the nut a quarter of a turn the other direction to move the brake shoes away from the brake drum's inner. Note that your official state CDL manual may not cover this process.

Turn the adjusting nut to move the end of the slack adjuster toward the air chamber until the nut stops turning. Then turn the nut the other way to move the brake shoes away from the inside of the brake drum.

Turn the adjusting nut either way until there is less than one inch of play in the slack adjuster.

Turn the adjusting nut to move the end of the slack adjuster away from the air chamber as far as it will go. Then turn the nut the other way to move the brake shoes toward the inside of the brake drum.

Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?

When driving an ABS-equipped tractor-trailer combination, the goal is to drive as carefully as you have always driven. Because of the ABS, do not drive any differently. Only use as much braking as is necessary to maintain control, be aware of your surroundings when slowing down, and brake consistently regardless of what you're driving. If speeding isn't already a part of your safe driving routine, don't do it.

You should use only the braking necessary to stay safely in control.

Brake the same regardless of what you're driving—whether you have a trailer, or ABS, or neither.

You should drive more quickly so that you will be able to keep the trailer and tractor straight.

When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control.

Free printable Alabama CDL Air Brake worksheet part 12

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Free printable Alabama CDL Air Brake worksheet part 12

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