Explain the term “independent brake”:

1. A device which causes the braking system to operate each wheel independently.
2. It is a device operated by the driver during continuous and steep descents.
3. A device within the braking system that brakes each wheel independently when the vehicle is slipping.
4. Correct answer: A spring loaded device that operates the braking system independently, and that starts operating when the air pressure in the braking system drops below its required level.

WhyAn independent brake is spring-loaded and activates by itself when the air pressure in the braking system drops below the required level. It is a safeguard in case the air system fails.