CDL General Knowledge TestCombination Vehicles (if applicable)Medium
During a pre-trip inspection of a combination vehicle, how much free play is acceptable in the steering wheel?
- ANo more than 3 inches (7.5 cm) or 10 degrees on a 20-inch wheel.
- BNo more than 2 inches (5 cm).
- CNo more than 4 inches (10 cm) or 15 degrees on a 20-inch wheel.
- DNo more than 1 inch (2.5 cm).
Show answer & explanationAnswer & explanation
Correct answer: A. No more than 3 inches (7.5 cm) or 10 degrees on a 20-inch wheel.
Excessive steering wheel free play indicates worn or loose steering components, which can make the vehicle difficult to control and is a safety hazard. The limit is 10 degrees or about 2 inches for a 20-inch steering wheel.
Why the other options are wrong
- B. 2 inches is closer, but the 10-degree rule for a 20-inch wheel makes 3 inches the more accurate upper limit.
- C. 4 inches or 15 degrees is considered excessive and would result in an out-of-service condition.
- D. 1 inch is too restrictive; some free play is normal and acceptable.
Steering Wheel Free Play
The amount of movement in the steering wheel before the steering mechanism begins to turn the wheels.
- Excessive play indicates worn components.
- Maximum allowable is 10 degrees or ~2 inches on a 20-inch wheel.
- Checked during pre-trip inspection.
Memory trick: Ten degrees or three inches, no more for a good drive.