How do you test hydraulic brakes for leaks?

To test hydraulic brakes for leaks, firmly pushing down the pedal for about 5 seconds is an effective method. This approach involves applying steady pressure to the brake pedal and observing whether it maintains that pressure or begins to sink toward the floor. If the pedal moves down significantly during this period, it can indicate that there is a leak somewhere in the hydraulic system. A steady pedal signifies that the hydraulic system is functioning properly without any leaks.

The other methods, while they may provide some indications, are not as reliable for diagnosing leaks as the pressure test. Listening for sounds or checking fluid levels may not reveal subtle leaks that could still affect braking performance. Visual inspections around brake lines can help identify obvious leaks but may not catch more concealed issues within the system. Thus, the firm pressure test is a valuable part of ensuring the integrity and safety of the hydraulic brake system.