When inspecting a vehicle equipped with hydraulic brakes, how should you test the brake pedal for system leaks?

1. Pump the brake pedal ten times quickly while the engine is turned off
2. Apply firm, steady pressure to the brake pedal for 10 to 15 seconds with the engine running and check if the pedal sinks
3. Press the pedal to the floor as hard as possible and release it immediately
4. Measure the distance from the steering wheel to the brake pedal with a tape measure