During overhaul, what safety step helps prevent vehicle movement?

• A. Chocking the wheels
• B. Positioning the vehicle on a ramp
• C. Disconnecting the battery
• D. Removing the ignition key

Answer: (A)

The essential safety step is to place wheel chocks to create a physical barrier that stops the wheels from turning. This directly prevents any movement, even if brake systems fail, the vehicle shifts, or someone bumps the control area during overhaul. Wheel chocks should be placed snugly against the tires on the wheels that could move, especially if the vehicle is on a slope or being worked near a lift. For best effect, use chocks on both sides of the wheels and ensure they’re stable and won't slip or slide out of position.

While disconnecting the battery or removing the ignition key reduce the chance of unintended starting, they don’t stop the vehicle from rolling if a break in the braking system or accidental movement occurs. Chocking the wheels provides a reliable, primary physical safeguard against movement during maintenance.