Pre-Trip Inspection
The seven-step inspection method.
11.1 The seven-step method
- Vehicle overview (approach, leaks, damage, last DVIR)
- Check the engine compartment
- Start the engine and inspect inside the cab
- Turn off the engine and check lights
- Walk-around inspection
- Check signal lights
- Start the engine and check the brake system
Tip: For the skills test, name each part and say what you are checking for (for example "not cracked, bent or broken").
Source: AAMVA / FMCSA — Commercial Driver License Manual (AAMVA model manual used by state CDL manuals) (Model manual — verify your state edition). Updated: 2026-10-09
11.2 Tires
Look for bulges, cuts, exposed fabric, mismatched sizes, and dual tires touching each other.
| Position | Minimum tread depth |
|---|---|
| Steering (front) axle | 4/32 inch in every major groove |
| All other tires | 2/32 inch |
Check Minimum tread depth on steering-axle tires?
Source: FMCSA — 49 CFR Part 393 — Parts and Accessories (incl. Subpart I Cargo Securement) (eCFR current), 49 CFR 393.75. Updated: 2026-10-09