Air Brakes CDL Practice Test

The Air Brakes Endorsement covers air brakes. Required for: Vehicles equipped with air brake systems. The official FMCSA test contains 25 multiple-choice questions; you must answer at least 20 correctly to pass.

25Questions on official test
20Required correct
63Practice questions in our bank
AIREndorsement code

About the Air Brakes endorsement

The Air Brakes test covers air brake system parts (compressor, governor, reservoirs, drain valves, alcohol evaporator, safety valve, brake pedal, foundation brakes), dual air brake systems, inspecting air brakes, using air brakes (normal stops, emergency stops, parking brakes), and proper procedures for braking on downgrades. If you fail or skip the Air Brakes test, your CDL is restricted to vehicles without full air brake systems.

Take the practice test in your state

Pick your state to get the Air Brakes practice test, plus your state's specific CDL fees, agency, and minimum-age rules.

ALAlabama AKAlaska AZArizona ARArkansas CACalifornia COColorado CTConnecticut DEDelaware DCDistrict of Columbia FLFlorida GAGeorgia HIHawaii IDIdaho ILIllinois INIndiana IAIowa KSKansas KYKentucky LALouisiana MEMaine MDMaryland MAMassachusetts MIMichigan MNMinnesota MSMississippi MOMissouri MTMontana NENebraska NVNevada NHNew Hampshire NJNew Jersey NMNew Mexico NYNew York NCNorth Carolina NDNorth Dakota OHOhio OKOklahoma OROregon PAPennsylvania RIRhode Island SCSouth Carolina SDSouth Dakota TNTennessee TXTexas UTUtah VTVermont VAVirginia WAWashington WVWest Virginia WIWisconsin WYWyoming

Study tips for the Air Brakes test

Your state's CDL handbook is the official study source — it's typically a free PDF on your state DMV's website, and it's adapted from the FMCSA CDL Manual that every state shares. Read the relevant chapter end-to-end at least once before you start drilling questions, then use practice tests to identify weak topics and re-read the corresponding sections.

  • Don't memorize answers. Memorize the reasoning. Real test wording differs from practice tests.
  • Practice the test sequences out loud. Especially for Air Brakes, where you must demonstrate the inspection sequence verbally.
  • Use the explanations. Every question on this site has an explanation that traces back to the FMCSA Manual chapter and section.
  • Time yourself. The official tests aren't strictly timed in most states, but consistent pacing helps you stay calm.
  • Schedule the test only when you score 100% twice in a row. Real tests cost time and re-test fees; better to over-prepare.