What happens if the brake pedal moves after applying firm pressure for 5 seconds during a test for hydraulic leaks?

When the brake pedal moves after applying firm pressure for 5 seconds during a test for hydraulic leaks, it suggests a hydraulic issue is present. This is indicative of a potential leak in the braking system or a failure in the hydraulic components, such as brake lines or master cylinder. A properly functioning brake system should maintain pedal pressure without significant movement when pressure is continuously applied. Movement of the pedal in this context indicates that hydraulic fluid is not maintaining the necessary pressure, which is essential for effective braking performance and safety. Identifying this issue is critical, as it may lead to brake failure if not addressed. Therefore, recognizing this change in the brake pedal position is vital for ensuring the reliability and safety of the vehicle's braking system.