What condition regarding the brake pedal reserve would indicate a failure for power-assisted brakes?

The appropriate condition indicating a failure for power-assisted brakes is having less than 1 inch of brake pedal reserve. Brake pedal reserve refers to the distance the brake pedal can be depressed without engaging the brakes. This is critical for ensuring that drivers have enough pedal travel to achieve safe and effective braking.

When there is less than 1 inch of pedal reserve, it suggests that the braking system is compromised and may not function efficiently in an emergency situation. Having an adequate amount of reserve is vital for maintaining control and preventing potential brake failures. A minimum of 1 inch allows for proper engagement of the braking system without the risk of bottoming out, which could lead to a loss of braking effectiveness.

Understanding this aspect of vehicle inspection is crucial for ensuring the safety and reliability of power-assisted braking systems. Therefore, identifying a brake pedal reserve of less than 1 inch as a failure point aligns with safety standards and the functional integrity required for power-assisted brakes.