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The complete assembly (including lining and backing) is then often called a brake pad or brake shoe. The dynamic friction coefficient "μ" for most standard brake pads is usually in the range of 0.35 to 0.42. This means that a force of 1000 Newtons on the pad will give a resulting brake force close to 400 Newtons.
Although brake pad wear is unique to each vehicle, it is generally recommended that brake pads be replaced every 50,000 miles, [6] while brake discs (or rotors) typically last longer, needing replacement every 70,000 miles.
A set of pads can be considered for replacement if the thickness of the pad material is the same or less than the thickness of the backing steel. In Pennsylvania, the standard is 1 ⁄ 32 inch (0.79 mm) for riveted pads and 2/32" for bonded pads.
Self-assist reduces the input force needed to apply the brake, but exaggerates fade, since a reduction in pad friction material height or thickness also reduces pad force. In contrast, for a brake without self-assist, such as a conventional disc brake, a loss of pad friction material does not change the pad force, so there is no necessary loss ...
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R90 calls for linings to be tested for speed sensitivity, cold performance, and replacement Brake pads and brake shoes are permitted to deviate from the frictional characteristics of their original-equipment counterparts by not more than 15%. [2] In addition, R90 requires tamper-evident, sealed packaging for replacement brake linings. [1]
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