Pressing and releasing the brake pedal unnecessarily can:

Question

On a vehicle with air brakes, pressing and releasing the brake pedal unnecessarily may let air out of the braking system faster than the compressor can replace it. This may cause the system's air pressure to become too low and the brakes to stop working.

Accepted Answer

Release air faster than it can be replaced.

Answer

Add more air to a brake system.

Answer

Make the brake pedal  harder to depress.

Answer

Create a loud noise.