Exposure To Asbestos

Exposure To Asbestos

The complete phasing out of asbestos was to take place by 1989 because time was needed to find alternatives.

Brake Light: November  1979

Exposure to asbestos was first discovered to be toxic in the 1960s but it was not until 1976 that a plan was enacted to phase out asbestos in brakes and other products. The fear in this industry was that an immediate all-out ban on the mineral in brakes pads and linings would lead to unsafe brakes. The complete phasing out of asbestos was to take place by 1989 because time was needed to find alternatives. Some manufacturers used Kevlar and other man-made materials – the one material that offered similar properties to asbestos was ceramic fibers. But during the slow phase-out process, brake pad manufacturers also became better at formulating semi-metallic materials leading to products that we have today. 

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As the metal tooth passed by the permanent magnet wrapped in copper wire, the magnetic field was altered and measured by a computer. This is not a sci-fi novel, but how a passive wheel speed sensor works. 

A passive wheel speed sensor is often called a “variable reluctance sensor” by some engineers. The sensor is mounted at a specific gap from a toothed reluctor ring. As the teeth pass by the wheel speed sensor, it changes the magnetic field and produces alternating current or AC voltage. The AC voltage can be seen by a scope as a sine wave. 

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