A portion of the CDL written test is dedicated to air brake systems. While hydraulic brakes (more common for lighter vehicles) use brake fluid to transfer pressure to the braking mechanism, air brakes use compressed air. If you do not pass the air brakes test, you will have a restriction placed on your CDL. This prevents you from driving vehicles using air brake systems and can make it much harder to find a truck driving job. Our training courses cover the material from the air brakes test.
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