Air Brakes Test
Add the Air Brakes endorsement to your CDL
About Air Brakes Test
The Air Brakes endorsement is required for any CDL vehicle with air brakes — and missing it is the #1 reason drivers fail their road test. This app gives you 250+ practice questions across 13 focused tests, covering dual air systems, governor pressure ranges, low-pressure warnings, spring brake parking, slack adjusters, the final air brake check, and emergency braking. Every answer is explained with the specific CDL Manual section.
What you'll find inside
- ✓ 250+ practice questions
- ✓ 13 timed practice tests
- ✓ Realistic mock test
- ✓ Detailed explanations
- ✓ Flash cards
- ✓ Voice readout
- ✓ Offline access
Practice Air Brakes questions free
Pick a topic and answer 10 free questions in your browser. No signup, no download required.
Air Brakes Test 01
Dual air systems, governor pressure, and air tank inspections.
Air Brakes Test 02
Slack adjusters, brake drums and shoes, and the s-cam mechanism.
Air Brakes Test 03
Spring brakes, parking brake controls, and emergency stopping power.
Air Brakes Test 04
Low-air warnings, leak tests, and pressure build-up requirements.
Air Brakes Test 05
Stab braking, controlled braking, and emergency stopping techniques.
Air Brakes Test 06
Air brake lag, total stopping distance, and following distance with air brakes.
Air Brakes Test 07
Pre-trip air brake inspection sequence and required checks.
Air Brakes Test 08
Trailer air brakes, glad hands, service lines, and emergency lines.
Air Brakes Test 09
The Final Air Brake Check — the 7-step in-cab pre-departure test.
Air Brakes Test 10
Brake fade, brake adjustment, and downhill braking strategy.
Air Brakes Test 11
Cold-weather operation: moisture in the air system and tank draining.
Air Brakes Test 12
Air dryers, alcohol evaporators, and air compressor lubrication.
Air Brakes Test 13
Mixed practice across all air brake topics — final review before your test.
Get Air Brakes Test on your phone
Unlock all 252+ questions, take unlimited mock tests, study offline on your breaks, and get every answer explained — for the price of a coffee.