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Chassis systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
Brake pads (Fig. 4.85) are steel-backed blocks of friction material, which are pressed onto both sides of the disc (also known as a brake rotor). Older types were asbestos based, so you must not inhale the dust. Pads should be changed when the friction material wears down to 2 or 3 mm. The circular steel disc rotates with the wheel. Some are solid but many have ventilation holes. Modern brake pad and shoe lining material is made from mineral fibres, cellulose, aramid, polyacrylonitrile (a resinous, fibrous or rubbery organic polymer), ceramics, chopped glass, steel, and copper fibres, carbon fibres or a similar material. There is no need to remember all these; just choose the correct replacement types as recommended by the manufacturer.
Recent progress in the research on natural composite brake pads: a comprehensive review
Published in Tribology - Materials, Surfaces & Interfaces, 2023
Ajith G. Joshi, K. N. Bharath, S. Basavarajappa
The common material ingredients or formulations of brake pads comprise binders, friction modifiers, base material, fibre reinforcements, abrasives, fillers, and lubricants. The reported literatures have employed different formulations to meet desired characteristics of brake pads. A summary of different types of tests employed for the property evaluation of brake pads is depicted in Figure 7. Seo et al. [85] have illustrated that contact plateaus play a vital role on the properties of brake pad surface. The wear resistance of brake pads strongly depends on the ingredients of friction materials and the braking environment. In addition, the volume fraction of reinforcement and filler materials as well as their types are of decisive importance and have a major influence on the number of contact plateaus. Thus, the composition of the brake pad affects its tribological properties.