How long must the brakes remain applied during a retest for a car that released its brakes prematurely?

The correct duration for keeping the brakes applied during a retest for a car that released its brakes prematurely is three minutes. This requirement is established to ensure that the braking system remains adequately engaged, allowing for an accurate assessment of its functionality. By maintaining the brake application for this specified time, any potential leaks or failures within the brake system can become evident, ensuring that the brakes are fully operational before the car continues on the track. The three-minute duration strikes a balance between being sufficiently long to identify issues and practical for operational workflows.

In the context of safety operations, thorough retesting is crucial, and adhering to this time frame helps to mitigate risks associated with brake failures.