CDL EXAM 2023 AIR BRAKES - Questions and Answers from the DMV (2023)


CDL EXAM 2023 AIR BRAKES.Questions and Answers DMV

General Knowledge

Air Brakes


Doubles & Triples

Pre-Trip inspection


Hazardous Materials

School bus

Tank vehicle

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Foreign foreign foreign, usually collects in compressed air tanks.

If you do not have an automatic tank drain.

When should you drain the air tanks after every working day? What is the s-cam used for to apply the brakes, which of the following makes the total stopping distance for air brakes longer than four hydraulic brakes brake, lag distance, the brake system that applies and releases the brakes when the driver uses the brake pedal is the service brake system to make an emergency stop with air brakes using the stop braking method.

You should break as hard as you can get off the brakes when the Wheels lock get back on the brakes when the wheels start rolling again, brake, lag distance at 55 miles per hour is black feet, 32 feet.

If your vehicle has an alcohol evaporator, it is there too reduce the risk of ice in the air brake valves in cold weather, what can legally hold a parking or emergency braking position for a truck truck tractor or a bus spring pressure, the breaking power of the spring breaks depends on the adjustment of the service brakes, which of the following should you do before leaving your vehicle unattended do all of the above set, the parking brakes, remove the keys and Chuck the wheels under which conditions our front wheel.

Brakes, good, all weather conditions.

If the air tanks are not drained, your brakes may fail because of water freezing, which of the following can cause breaks to fade or fail, all of the above excessive use of the surface breaks, not relying enough on engine, braking and brakes been out of adjustment.

What is the best way to test if your vehicle's Spring Breaks come on automatically all of the above are correct continue to step on and off the brake pedal until the manufacturers of PSI specification is met for spring breaks to engage on single Vehicles continue to step on an after brake, pedal until the parking brake valve pops out on tractor.

Trailer, vehicles continue to step on and off the brake pedal until the parking brake valves pops out if your vehicle has a properly functioning dual air brake system and minimum sized air tanks, the air pressure should build from 85 to 100 PSI Within, blank seconds, 45 seconds, the air compressor will stop pumping air into the air tanks at blank PSI, 125 psi, an anti-lock braking system or ABS system activates when your wheels are about to lock up, excessive heat cost by overuse of the service brakes can cause the brakes to fade excessive use of the surface breaks may result in overheating, which can lead to expansion of the brake drums a typical air brake system is fully charged at 125 psi during no more driving spring.

Breaks are usually held back by air pressure during your final air brake, check if the air pressure does not build up fast enough.

The air pressure may drop too low during driving to test the static air leakage rate.

You should turn off the engine, release the parking brake.

And let the system.

Settle air brakes use blank to make the brakes work compressed air.

When you press on the brake pedal compressed air enters the brake Chambers, the air compressor Governor controls.

When air is pumped into the air tanks of the choices below the first thing to do when a low air pressure warning comes on is stop and safely Park as soon as possible air brake equipped vehicles must have a supply pressure, gauge modern air brake system combines three different systems.

They are the service brakes, the parking brakes and the emergency brakes.

If you must make an emergency stop, you should break so that you stay in a straight line and can steer the driver must be able to see a warning that is given before air pressure in the service air tanks Falls below 60 PSI, the most common type of foundation breaks found on heavy Vehicles is the s-com break when driving down a long Steep Hill.

You should release the brake when you're up five miles per hour below your safe speed.

The modulating control valve is a spring-loaded valve double layer, put on the brakes on slowly, if the service brakes fail, which of the following will be true about your break function and your anti-lock braking system.


You will still have no more brake function.

And it will just need to get the ABS repaired as soon as possible, which of the following is not part of the break-in process when you're driving a tractor-trailer Combination Vehicle when an anti-lock braking system, you should drive faster so that you will be able to keep the trailer and tractor straight, which of the following are true about a dual air brake system.

All of the above are true, usually one system operates the front axle.

And the other one operates, the rear axle.

It uses a single set of brake controls.

One system is called the primary system.

And the other one is called the secondary system.

How can you tell if your vehicle is equipped when an anti-lock braking system check if the vehicle was manufactured after 1998, spring, breaks are all of the above brakes that come on automatically on a truck or tractor when the PSI drops too low made up of powerful Springs that are held back by air pressure, while you're driving not going to take full effect onto your PSI drops to a certain range typically 20 to 30 PSI in the event of a brake system failure.

The emergency brake system uses blank to stop the vehicle parts of the service brakes and the parking brakes repeatedly pressing and releasing found in the brake pedal may result in a loss of brake, air pressure.

If the spring breaks are on, when should you push the brake pedal never? You will know that your brakes are fading.

If you have to press the brake pedal hotter than usual to control your speed, a converter Dolly with anti-lock brakes is required to have a yellow lamp on the left side, which of the following is the most important thing about hard breaking don't lock the wheels for longer than an instant in controlled breaking.

You break in a straight line if oil and water collects in the air tanks, what could happen to the brakes? The brakes could fail? S-Com drum brakes have an s-com in each brake chamber.

Why is it called an s-cam? It is shaped like the letter s to test the Earth service, brakes break firmly while slowly moving forward.

When can you leave your truck unattended without first applying the parking brakes or chucking the wheels? Never if your truck or bus has dual parking control valves? It means that you can use pressure from a separate tank to release the spring brakes to move a short distance, the brake pads should be blank for the brakes to be on against the drum.

You should know that your brakes are fading when you must push hotter on the brake pedal to control your speed on the downgrade, the application pressure, gauge shows the driver how much pressure is being applied to the brakes.

If the air compressor should develop a leak.

What keeps the air in the in the tanks, the emergency relay valve, why drain water from the compressed air tanks water can freeze in cold weather and cause brake failure during normal driving spring.

Breaks are usually held back by air pressure brick, drums must not have cracks longer than blank the width of the friction area to one half after the initial drop, the maximum acceptable leakage rates per minute, are three PSI for single vehicles and four PSI for combination vehicles.

How do brakes work on a long steep downgrade? They work as a supplement to the braking effect of your engine? How will you check your truck's slack, adjusters use gloves and pull hard on each slack adjusters.

You can reach the parking brake control lets the air out of the brake Chambers.

If the low air pressure warning signal is not working, it may lead to certain emergency braking in a single circuit air system.

Your vehicle has a dual air brake system.

One of the systems loses air pressure.

What will happen either the front or rear brakes will not be fully operational under ideal conditions.

The average driver of a truck or bus equipped with air brakes and traveling at 55 miles per hour.

Would require what stopping distance more than 400 feet? Modern air brake systems are three different systems combined.

The service breaks the parking brakes and blank breaks emergency brakes.

If your truck or bus has dual parking control valves, it means that you can use pressure from a separate tank, too release the spring brakes to move a short distance, the brake pads should be blank for the brakes to be on against the drum.

If your vehicle has an alcohol evaporator every day during cold weather, you should check and feel the alcohol level with s-cam drum brakes when the brake chamber fails with air pressure, pushes the push Road out moving the blank and thus rotating the blank slack adjusters and the brake camshaft in which of the following situations should you not apply the parking brakes? If the brakes are very hot, which of the following can cause breaks to fail or fade overheating low air pressure and not relying on the engine? Braking effect if you need to stop quickly and your vehicle lacks anti-lock brakes, you can use either of the above controlled breaking method or the stop breaking method tractor and a straight track.

Spring, breaks will come fully on when the air pressure drops to a range off 20 to 45 PSI.

The modulating control valve allows you to control there, spring, brakes, air loss in a straight truck, or bus should not be more than blank with the engine off.

And the brakes applied, three PSI in one minute.

What activates the stop switch? Air pressure, a straight tracker Bus air brake system should not leak at a rate of more than black PSI per minute with the engine off.

And the brakes released it's.

Two PSI vehicles with air brakes must have an air pressure gauge to show the pressure available for braking slack.

Adjusters should not have any more than blank of play one inch of clay, no more than one inch.

What is the best way to test your vehicle's, low air pressure warning signal with the engine off step on and off the brake pedal to lower the air pressure below 60 PSI, which vehicles must have low air pressure warning signals all vehicles with air brakes.

Currently in operation must have low air pressure warning signals on a long or steep downgrade.

Once you have reached your safe speed break until you are traveling 5 miles per hour slower to check the slack adjusters on s-com drum brakes.

You should first Park on level, ground, Chuck, the wheels and release the parking brakes before starting down a hill.

You should be in the proper gear.

So you can only have to apply the brake just hard enough to feel a definite slow down to apply the parking brakes on the normal conditions.

Let the air out of the brick Chambers slack, adjusters are all of the above it's between the power, screw and push right on the on disc brakes a part of the air brake system that is used to adjust the brakes between the push rod and s-cam on drum brakes, which of the following is not part of the air brake system.

Radio signal system air braking takes more time than hydraulic braking because air brakes need to have airflow through the lines to work in air brake vehicles.

The parking brakes should be used whenever the vehicle is parked the brake pedal in an air brake system, controls the air pressure applied to the brakes.

Your vehicle has a dual air brake system if a low air pressure warning comes on for the secondary system.

You should stop safely Park and continue only when the system is fixed.

The tractor protection valve does all of the above will close automatically.

If the air supply drops to a certain level, we'll close, if you apply the parking brakes provides the air supply for the brake system, what is the first thing you should do if the low air pressure warning comes on stop? When should you use the parking brake, every time you lift your vehicle with a few exceptions? The supply pressure gauge shows the driver how much pressure is in the air tanks, which of the following is not part of the Drone break, the safety valve the safety release valve will blow at blank PSI 150 psi in an emergency.


You should use the stab breaking method.

What are spring breaks if the air brakes leak down Springs apply the brakes to stop the vehicle.


How many wrong answer can get on a brake system on a CDL test? ›

To pass the road test portion of the CDL driving performance evaluation (DPE), you must make no more than 30 errors and no critical driving errors, which will result in an automatic failure. Interpreters are prohibited.

What is the CDL air brakes permit test in Georgia? ›

The GA CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Georgia CDL Manual. Take this GA CDL practice test now to prepare for the actual air brakes test!

What you need to know about air brakes? ›

An air brake is a type of friction brake for vehicles in which the compressed air pressing on a piston is used to apply pressure to the brake pad or shoe. The compressed air is created by a compressor while an air dryer stops moisture particles from entering the air braking system.

What is the hardest part of CDL test? ›

Then the DMV will assess your knowledge with a written test and inspection test and test your physical driving skills with a driving test. The general consensus is that the road test is the hardest part of getting your commercial driver's license (CDL).

What are the 3 modern air brake systems? ›

Air brakes are really three different braking systems: service brake, parking brake, and emergency brake.

Do you need a CDL for a truck under 26000 lbs with air brakes in Georgia? ›

Q: My truck has air brakes, but a GVWR of under 26,001 lbs. Do I need a Commercial Driver's License? A: No, unless the vehicle is used to transport hazardous materials that require placards.

How do I get an air brake endorsement in Georgia? ›

To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Georgia Commercial Driver's Manual.

Do you need a CDL to drive a truck with air brakes in TN? ›

Does a truck with air brakes require a CDL? No. This a common misconception; a CDL is not required to operate a truck with air brakes as long as the GVWR is 26,000 lbs. or less.

What are the 3 tests for CDL permit in Georgia? ›

Be prepared to: Show all your documents. Pass a Vision Exam. Take and pass the required written knowledge exams.

How many questions are on the Georgia Class B CDL permit test? ›

What to expect on the actual GA DDS exam
How many questions50
How many correct answers to pass40
Passing score80%

How many questions are on the Georgia CDL combination test? ›

Drivers who want to drive combination vehicles must pass the combination vehicles test. The Georgia CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%).

What are the two types of air brakes? ›

All vehicles using air brake systems have one of two major brake types at the wheels - drum brakes or disc brakes.

What are the 5 major components to an air braking system? ›

  • Simple Air Brake System.
  • One Way Check Valve.
  • Gauges.
  • Brake Application Gauge.
  • Low Pressure Warning.
  • Wig-Wags.
  • Stop Light Switch.
  • Quick Release Valve.

What is the cut in pressure for air brakes? ›

The air pressure gauge tells you the adequacy of the air system. Air compressors typically have a “cut-out” pressure between 110 psi and 130 psi and a “cut-in” pressure about 20 psi lower. Air pressure build-up from 85 psi to 100 psi should take 45 seconds or less.

Which CDL is the easiest? ›

Make Your State The Easiest State to Get a CDL

So, if you're still wondering what the easiest state to get a CDL in is, just know it includes Florida, Georgia, Alabama, Kentucky, Tennessee, Mississippi, Indiana, and South Carolina, because that's where our schools are located.

What state has the hardest CDL test? ›

Washington state has one of the toughest driving tests in the country. According to the state Department of Licensing, passing rates for the knowledge test are around 46% at DOL offices. A study by personal-injury law firm Siegfried & Jensen suggests Washington is the most difficult state to get a license.

What is the most basic CDL? ›

Class A License

The Class A CDL License is the most common of commercial licenses and is required to obtain for all aspiring truck drivers in order to legally pursue a career in trucking.

What is the purpose of retarders? ›

Retarders are used to further improve the braking performance on commercial vehicles. Like engine brakes, they are wear-free continuous brakes. Retarders relieve the service brake and increase the active safety and cost-effectiveness of commercial vehicles. Retarders are installed in a commercial vehicle's drive train.

What is the most common air brake? ›

Foundation brakes are the most common air brake systems in trucks and buses. They use a triple-valve principle which charges air into the tank, applying the brakes, and releasing them.

What most weight I can haul without a CDL? ›

The federal requirement specifies that, when a vehicle has a GVWR of 26,000 pounds or less, the operator does not need a CDL license.

How much does CDL school cost in Georgia? ›

Time to complete this education training ranges from 1 hour to 6 months depending on the qualification, with a median time to complete of 3 weeks. The cost to attend Atlanta Truck Driving School ranges from $10 to $7,000 depending on the qualification, with a median cost of $2,700.

How long does it take to get CDL in GA? ›

Class A CDL Course Total Time: 180 Hours

There is a lot to learn, and we have perfected our course since our beginnings in 1995 with our state-of-art classroom study followed by what every truck driver must know along the roads.

What weight do you need a CDL in Georgia? ›

In the state of Georgia, a CDL is required for any driver planning to drive the following types or combination of vehicles: A combination of vehicles weighing 26,001 pounds or more. A single vehicle with a gross vehicle weight of 26,001 pounds or more.

What is a Class B license in GA? ›

Class B (Commercial) - Any single vehicle with a GVWR of 26,001 pounds or more, or any such vehicle towing another vehicle, not in excess of 10,000 pounds. Includes vehicles in Class C, but not Class A. Knowledge and driving skill exams are required.

What is the brake pedal in the air brake system? ›

The brake pedal controls the air pressure applied to the service brakes. As the pedal is pressed downward, compressed air passes through a valve attached to the brake pedal and is delivered to the brakes at the wheels.

What is the stop light switch? ›

The stop light switch (Fig. 22) is an air-signaled electrical switch which is turned on any time a brake application is made. The switch is usually connected to a double check valve and can be plumbed anywhere in the application side of the circuit.

How many feet is a straight truck? ›

Straight Truck Dimensions and Capacities

Here's what else you should keep in mind: Straight Truck Length: Most straight trucks measure between 10 and 26 feet from end to end. Straight Truck Height: Straight trucks usually stand 8 to 10 feet tall.

How do I schedule a CDL permit test in GA? ›

  1. GA Department of Driver Services offers an online appointment system to schedule Road Test Appointments. ...
  2. Don't forget to fill out the required License/ID/Permit form before you visit a center. ...
  3. We also encourage you to visit the Road Test Appointments page to get a full list of documents before your visit.

What is on the CDL road test in GA? ›

The CDL Skills Test is a three part test that consists of a Pre-trip Inspection, a Basic Vehicle Controls Test, and an On-Road Driving Test. You will be required to take the test in the same class and type of motor vehicle that you plan to drive once you obtain your CDL.

What is controlled braking? ›

Controlled braking – Level of braking done with sufficient pressure to slow the vehicle. Engine acceleration – Releasing pressure from the brake pedal, allowing the low idle of the engine to move the vehicle forward.

How long is the Georgia CDL permit test? ›

The pre-trip inspection will take about 45 minutes to an hour. The yard maneuvers will take about 45 minutes and the road maneuvers take about 30 minutes. If you pass all three parts of the test you will receive a CDL license.

Can I take my permit test online in Georgia? ›

New drivers can even head to the Georgia DDS website to take an online learners permit practice exam. The applicant must be at least 15 years old and a parent or guardian must be present to sign the application. There is a $10 fee to take the exam at the DDS.

What does CDL stand for? ›

Most drivers must obtain a commercial driver's license (CDL) through their home State (it is illegal to have a license from more than one State).

How to pass doubles and triples test for CDL holders in Georgia? ›

Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Georgia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%).

How many questions are on the CDL combination test NJ? ›

The test fee is $125. The knowledge test is a 50-question general test with additional separate tests for each endorsement. To pass the test you must answer at least 80% of the questions correctly.

How many questions are on the general knowledge CDL test in Tennessee? ›

At the Tennessee DMV, if you're hoping to get a commercial driver's license, you have to take a 50 question general knowledge exam.

What is air brake also known as? ›

An air brake also is known as a compressed air brake system or pneumatic brakes. It is a type of friction brakes. The compressed air used to apply the pressure to the brake pad via piston action. Air brakes are used in large heavy vehicles such as trucks, buses, trailers, and railways.

What are 2 piston brakes? ›

A 2 piston caliper has 1 piston on each side, and a 4 piston caliper has 2 pistons on each side. Since 2 pistons are wider than 1, the brake pads are also typically wider which means the brake pad's surface area is larger, creating more friction and more stopping power.

What are the basics of air brakes? ›

Air is pressurized by an engine-mounted compressor. The air compressor then pumps the air into the air storage tanks, which store the compressed air until it's needed. Air pressure is used to apply the service brakes and release the parking brake. There are multiple air circuits in the system.

What is the max and min PSI for air brake test? ›

Test air leakage rate:

The loss rate should be less than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles. Then apply 90 psi or more with the brake pedal.

How do you calculate brake pressure? ›

You need only two simple math equations to commit to memory. First, the equation for calculating the surface area of a circle (caliper or master cylinder piston) is p(3.14) x radius2. Second, pressure is equal to the force divided by the area or pounds per square inch.

What is the best brake pressure? ›

“The key ingredient to any brake system is line pressure,” Dickson comments. “That pressure determines the clamping force of the calipers. We recommend at least 1,200 psi as the ultimate line pressure under severe braking conditions.”

How do you calculate brake test? ›

Brake Efficiency Formula

To calculate brake efficiency, divide the total vehicle weight by the brake effort, then multiply by 100.

How do you perform a brake test? ›

STEP 1: Before starting the engine, depress the brake pedal fully. The brake boost light should come on and the pedal should stiffen about halfway down. You should hear the electric motor kick in with a low pitch whine. STEP 2: With your foot over the brake pedal, turn the key to the on position.

How do you calculate braking distance in CDL? ›

The braking distance represents the distance your vehicle travels from the time you first depress the brake until the vehicle comes to a complete stop. Add up all of those distances, and you will have your total stopping distance.

How many brake tests do I need? ›

You should get your HGV or trailer's brakes tested by a roller brake tester ( RBT ) at least 4 times per year, including at the MOT.

What is the boiling point of DOT 4 brake fluid? ›

Lucas' DOT 4 Brake Fluid has a higher dry boiling point, 446 degrees Fahrenheit, it also tends to be less hygroscopic, so though it is affected with age, the boiling point tends to drop less than with DOT 3.

What is the stopping distance for brake test? ›

The braking distance, also called the stopping distance, is the distance a vehicle covers from the time of the full application of its brakes until it has stopped moving. This is often given as a 100-0kph distance, e.g. 56.2m, and is measured on dry pavement. Occasionally the time taken to stop is given, too.

What is the max and min psi for air brake test? ›

Test air leakage rate:

The loss rate should be less than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles. Then apply 90 psi or more with the brake pedal.

At what PSI do air brakes lock up? ›

The governor controls when the air compressor will pump air into the air storage tanks. When air tank pressure rises to the “cut-out” level (around 125 pounds per-square-inch or “psi”), the governor stops the compressor from pumping air.

What is the rule of thumb for braking distance? ›

The rule of thumb for determining the stopping distance is: thinking distance (speed divided by 10 times 3) plus braking distance (speed divided by 10 times speed divided by 10).

What is the braking distance at 30 miles per hour? ›

44 feet 45 feet

What is the distance to stop at 60 mph? ›

Virtually all current production vehicles' published road braking performance tests indicate stopping distances from 60 mph that are typically 120 to 140 feet, slightly less than half of the projected safety distances.

What is the minimum brake pad thickness to pass DOT inspection? ›

Hydraulic or electric braked commercial motor vehicles shall not be operated with a lining/pad thickness less than 1.6 mm (1⁄16 inch) (measured at the shoe center) for disc or drum brakes.

How long does a brake test take? ›

Brake inspections are important to ensure your safety on the road. A typical brake inspection takes less than 30 minutes but may take longer if the vehicle requires repairs and maintenance.

At what speed do you complete a brake pedal test? ›

Typically auto manufacturers conduct braking tests at 60 mph (96 kph).

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