Not affiliated with any state DMV or AAMVA. Original questions based on the Texas Commercial Motor Vehicle Drivers Handbook (DL-7C, revised March 2026).
CDL air brakes test: practice test with original questions from a state CDL handbook
Practice for the CDL air brakes knowledge test with 59 original questions written from a state CDL handbook based on the national model manual (Texas DL-7C, revised March 2026), in English and Spanish.
59 questions · Modes: Study, Topic drill, Daily 5
About this test
Practice for the CDL air brakes knowledge test with original questions written from the air brakes section of the Texas Commercial Motor Vehicle Drivers Handbook (DL-7C, revised March 2026), which follows the national AAMVA model CDL manual used by most states. Every correct answer is backed by a passage of the handbook and checked by two independent verifiers.
- Study: every question with a short explanation.
- Topic drills: parts of an air brake system, dual air brake systems, inspecting air brakes, using air brakes.
- Mock test: not offered, because the handbook states the 80% pass mark but not the number of questions.
The questions are written in our own words in English and Spanish; this is not any state's question bank. The CDL general knowledge test and other endorsements are separate pages.
Topics
- ABS effect · 1
- ABS lamp · 1
- ABS malfunction · 1
- ABS requirement · 1
- Air tanks · 1
- Application gauge · 1
- Automatic adjusters · 1
- Brake fade cause · 1
- Brake heat · 1
- Brake lag · 1
- Brake pedal use · 1
- Broken warning · 1
- Bus warning · 1
- Common problem · 1
- Compressor belt · 1
- Compressor drive · 1
- Compressor oil · 1
- Controlled braking · 1
- Downgrade · 1
- Drum cracks · 1
- Dual system · 1
- End of day drain · 1
- Fanning · 1
- Front brake limiting valve · 1
- Governor cut-in · 1
- Governor cut-out · 1
- Governor test · 1
- Lag distance · 1
- Leakage rate · 1
- Light load skid · 1
- Linings · 1
- Low air · 1
- Low air warning · 1
- Manual adjustment · 1
- Manual drain · 1
- Minimum buildup · 1
- Normal stop clutch · 1
- One system low · 1
- Parking brake exceptions · 1
- Parking brake test · 1
- Parking control · 1
- Pedal and spring brakes · 1
- Pressure buildup · 1
- Safe speed release · 1
- Safety valve · 1
- Safety valve release · 1
- Service brake test · 1
- Slack adjuster prep · 1
- Spring brake range · 1
- Spring brakes · 1
- Spring brakes and load · 1
- Stab braking · 1
- Stopping distance factors · 1
- Trailer supply · 1
- Unattended vehicle · 1
- Warning shutoff · 1
- Warning test · 1
- Wet brakes · 1
- Why drain tanks · 1
Sources and version
- Texas Commercial Motor Vehicle Drivers Handbook (DL-7C)Covers: Revised March 2026
Covers: Texas DL-7C, revised March 2026 · Verified current as of Oct 28, 2026
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How this page was made
Written by AI from the sources listed above, checked automatically, not reviewed by a person. Where the source licence allows it the questions keep the source wording; otherwise they are original questions based on the source. Every answer shows its source. This is not legal, immigration, medical or financial advice.