brakes

Overrun brakes

1) Brakes which are automatically applied on the overrun of a trailer (ie when the vehicle slows down, the trailer pushing on the coupling applies a spring operated brake).

Auto-reverse brakes

1) On light trailers with overrun brakes, a system which allows the driver to reverse vehicle by overriding the overrun mechanism without leaving his seat (ie provides instant reverse facility which is otherwise not possible). Legally required on new trailers since 1 April 1989.

Vacuum brakes

1) Brakes on (heavy) vehicles operated by vacuum system - as opposed to air. Not found on modern vehicles.