Mississippi CDL Air Brakes practice test
The Air Brakes test covers Section 5 of the Mississippi CDL Manual and is required if your vehicle has air brakes (1.1.1, p. 1-5). Skip or fail it and your CLP or CDL carries the L restriction, no air brakes (p. 1-3).
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Key facts
| Pass mark | 80% on this test | 49 CFR 383.135 |
|---|---|---|
| Who takes it | Anyone whose vehicle has air brakes, including air over hydraulic | MS CDL Manual p. 1-5 |
| Covers | Section 5: air brake parts, dual systems, inspection, use | MS CDL Manual Section 5 |
| If you skip it | Restriction L: no air-brake vehicles | MS CDL Manual p. 1-3 |
Topics
What the Air Brakes test covers
Questions drivers ask
- What is on the Mississippi CDL air brakes test?
- Section 5 of the Mississippi CDL Manual: the parts of an air brake system, dual air brake systems, inspecting air brakes and using air brakes. You must take it if your vehicle has air brakes, including air over hydraulic brakes.
- Source: Mississippi CDL Manual (March 2025), Section 5 and p. 1-5
- What does the L restriction mean on a Mississippi CDL?
- No air brakes: you may not drive a commercial vehicle with any type of air brakes. It is added if you skip or fail the air brakes knowledge test, or take the skills test in a vehicle without air brakes.
- Source: Mississippi CDL Manual (March 2025), p. 1-3
Sources
Mississippi Commercial Driver's License Manual, version March 2025, Mississippi Department of Public Safety. Page references are to its printed page numbers. CDL Mile is independent and not affiliated with Mississippi DPS.
Updated for the March 2025 Mississippi CDL manual. Last checked November 5, 2026.
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