Brake lining

In most modern vehicular applications the system is conceptually identical, except the rims would be replaced with solid steel (or sometimes exotic metal) disc.

The tang contacts the rotors when the linings are worn out, causing an annoying noise designed to alert the motorist that brake servicing is required.

However, studies such as a 1989 National Institutes of Health item showed an uncommonly high proportion of brake mechanics were afflicted with pleural and peritoneal mesothelioma, both of which are linked to chrysotile and asbestos exposure.

Most countries in the world now prohibit the use of brake linings made of asbestos for the sake of people's health and environmental protection.

An annoying squeal caused by the warning tang is designed as a typical audible alert that the pads need to be replaced; some vehicles may also have electrical brake wear indicators.

If the squeal or wear indicator is ignored for too long, drum or rotor damage (usually accompanied by an unpleasant grinding sound or sensation) together with degraded braking capacity will be the result.

Typical symptoms will be brake chatter, where the pads vibrate as the lining grabs and releases the rotor's surface.

Drum shoes with linings
In this view of an automobile disc brake , the brake pad is the black material held by the red brake caliper . The brake lining is that part of the brake pad which actually contacts the metal brake disc ( rotor ) when the brake is engaged.