Air Brakes
Removes the air-brake restriction — and it's the one people fail.
Anyone who wants to drive air-braked trucks. Without it your CDL carries a B restriction and you cannot drive air-brake vehicles.
Air Brakes is the exam most applicants get wrong because the numbers matter: when the low-air warning has to come on, what pressure the parking brakes need, how much leak is too much, and why air brakes reach you a half-second later than you expect. This bank drills those thresholds and the pre-trip tests that prove a system is safe to drive.
What the bank covers
- Dual air systems and reservoirs
- Low-pressure warning and spring brakes
- Compressor cut-in and cut-out pressures
- Air brake lag and brake fade
- Leak-rate and pressure-build tests
- Draining tanks and winter air problems
What you get
- —Each test draws 50 questions from a 100-question bank written from the same material your state handbook covers.
- —The correct answer and the reason behind it, shown after you finish.
- —Unlimited retakes — every attempt pulls a fresh mix of 50 questions from the 100-question bank, with answer choices reordered too.
- —A result broken down by topic, so you can see which section is costing you marks.
- —A suggested 25-minute limit, so you can practise under the pace of the real test.
SheDrivesSheRides is an independent training business and is not affiliated with any DMV or state agency. Practice questions are written from widely published CDL handbook material — always confirm the exact requirement and current figures against your own state's handbook before you sit the test.