Warning contacts

Some brake pads are equipped with warning contacts. When the brake pad approaches its wear limit, warning contacts notify the driver that the pad needs replacing. This functions in various ways. A wire may be incorporated in the brake pad. When the pad is sufficiently worn, the wire is exposed and contacts ground. A signal is then transmitted to the driver, or the system makes use of Ohm’s law. The thinner the pad, the greater the electrical resistance, making it possible to indicate wear fairly... read more

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Some brake pads are equipped with warning contacts. When the brake pad approaches its wear limit, warning contacts notify the driver that the pad needs replacing. This functions in various ways. A wire may be incorporated in the brake pad. When the pad is sufficiently worn, the wire is exposed and contacts ground. A signal is then transmitted to the driver, or the system makes use of Ohm’s law. The thinner the pad, the greater the electrical resistance, making it possible to indicate wear fairly accurately. Alternatively, an acoustic system is used. An additional metal part is embedded in the brake pad. When the pad is sufficiently worn, the metal comes in contact with the brake disk and the driver hears a noise. This system is used in older vehicles and by some Asian manufacturers.

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