Brake pad wear indicator - has mechanical slide compressed, reducing slide electrical resistance according to wear

摘要

The wear indicator for disc or drum brakes in vehicles comprises a variable electrical resistor in a mechanical guide and slide device, connected to be slid by the wear displacement of the brake. The output of the resistor is displayed at a meter on the instrument panel of the vehicle. In the case of a disc brake the devi ce (20) may be connected between the support plates (18, 19) of two opposing brake pads (16, 17) and the indication is given by the resistance change due to the support plates moving towards one another as the pads wear.