Meter; Tapley brake testing meter in leather case, circa 1975

Metal meter with clamp and leather case.

This meter is a mechanical device that measures the total braking effort achieved by a vehicles brakes. It does not check individual wheel performance and consequently has been replaced by rolling road facilities.

The meter is clamped to a convenient part of the vehicle, is set and the vehicle run up to speed and the brakes fully applied . The braking efficiency is read off on a scale. This type of meter appears in use on an RT-type bus at Aldenham in the film "Overhaul".