What happens if the parking brake does not hold a vehicle stopped under slight acceleration in low gear?

When a parking brake fails to hold a vehicle that is stopped under slight acceleration in low gear, this indicates a malfunction in the braking system, which is critical for ensuring vehicle safety. An effective parking brake is vital as it prevents a vehicle from rolling when parked, particularly on inclines or during unexpected situations.

In the context of vehicle inspections, a parking brake that does not function as intended is a safety concern. Inspections are designed to ensure that all components of a vehicle meet safety standards. If a parking brake cannot secure the vehicle, it poses a risk not only to the driver but also to others on the road. Therefore, it is classified as a failure during the inspection process.

Other options imply either acceptance despite the malfunction or that further testing might be able to determine the condition of the brake system. However, the primary aspect of this scenario is safety, and any failure of this magnitude leads to an automatic inspection failure. In summary, for a vehicle to pass inspection, all systems including the parking brake must function properly and meet regulatory requirements, thus leading to the conclusion that failing to hold under slight acceleration results in a failed inspection.