How do you test hydraulic brakes for leaks?

The correct method for testing hydraulic brakes for leaks is to pump the brake pedal three times and then hold that pressure for five seconds. This technique is effective because it creates a stable hydraulic pressure within the brake system. If there are any leaks present, the brake pedal will gradually sink to the floor or feel spongy, indicating that hydraulic fluid is escaping from the system. This method allows the driver to confirm that the brake system is maintaining pressure, which is crucial for safe operation.

Other methods, such as simply looking for fluid under the vehicle or listening for unusual noises, may not provide a thorough assessment of the integrity of the hydraulic brake system. Assessing pressure loss through pedal feel and responsiveness is a more direct and reliable approach to identifying potential leaks in the hydraulic system.