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This is because not taking the CDL Air Brake Test acts as a restriction on your CDL instead of an endorsement of additional driving skills.Ĭan Anyone Drive a Vehicle With Air Brakes? You can prepare for the test by taking our air brakes quiz or another CDL practice test for air brakes, and using a CDL air brakes study guide.Īir brakes are not considered a CDL endorsement even though the test is optional.
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The CDL Air Brakes Test is part of the CDL written knowledge test and consists of 25 questions. How Many Questions Is The Air Brake Test? The Air Brake Test covers the different braking systems and tests you on your knowledge of parking brakes, service brakes, emergency brakes, reading low pressure warnings, checking pressure gauges, and more. If you plan to drive a truck that requires the use of air brakes, you must take the Air Brake Test as part of getting your CDL. Air brakes are used on larger, heavier vehicles because they are more reliable and have less room for error than traditional hydraulic braking systems. The main difference between air brakes and traditional brakes (also known as hydraulic brakes) is that traditional brakes use fluid to stop the vehicle and air brakes use compressed air. The supply and service lines ensure proper braking function and include:ĭifferences Between Air Brakes and Traditional Brakes There is also a front and back reservoir that serve as backups for any air leaks. The second main part of an air brake system, the control system, is divided into a trailer brake circuit and a parking brake circuit, as well as brake circuits for the front and rear wheels. This air is stored in the supply reservoir which sends the air to the parking brake reservoir, primary reservoir, secondary reservoir, and auxiliary air supply distribution point. The supply system also contains a smaller purge reservoir to store and clean atmospheric air. Air brake systems are broken into two main parts: the supply system and the control system. The air pressure comes from atmospheric air and is compressed into the truck’s air compressor until the reservoir is around 120 PSI.Īir braking systems have several parts to ensure safe and proper braking control for large vehicles. For trucks with air brakes, the brake is held using spring pressure and air pressure. These features include:Īir brakes have different properties than traditional hydraulic brakes. They remain effective even if there is an air leak.Īir brakes include a variety of features to improve braking control and ensure backups for safety. They offer controlled pressure and backup air tanks to compensate if the compressor fails. Air brakes use atmospheric air that never runs out, rather than fluid which can leak. We’ve compiled a helpful resource on the basics you will need to know to pass your CDL Air Brakes Test, along with a practice air brakes quiz to get you started.Īir brakes are used on heavy trucks and buses because it provides a safe and reliable way to safely stop large moving vehicles.Īir brakes have several benefits over traditional hydraulic braking systems including:
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The best way to prepare for your CDL Air Brakes Test is to use CDL practice tests for air brakes, CDL air brakes study guides, and to take air brakes quizzes so you feel comfortable with the information before it’s time to take your test for real.
CALIFORNIA CDL GENERAL KNOWLEDGE TEST DRIVERS
Drivers who take and pass this test are eligible to drive vehicles that require a CDL permit and use an air brake system. One optional section is the CDL Air Brakes test. The CDL general knowledge test covers several different sections.