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Influence of disc topography on generation of brake squeal1 Prime Novelty of the Paper: It is shown that small pits in the brake disc surface lower the coefficient of friction. The friction coefficient gradually increases as the spits are worn away. Brake squeals are prevented as long as the coefficient of friction is below a critical value. This is a unique test for investigation of the correlation between disc topography, friction coefficient and brake squeal generation without changing any other test parameters.1

Elsevier B.V.
Publication Date
DOI: 10.1016/s0043-1648(99)00064-2
  • Brake Squeal
  • Coefficient Of Friction
  • Surface Topography
  • Disc Brake
  • Brake Disc
  • Mathematics


Abstract The influence of the disc topography on the generation of automotive disc brake squeal has been studied. Two brake discs were shot-blasted to produce small pits in the disc surface. The discs were then tested in a special brake squeal rig. During the tests, the coefficient of friction increased from about 0.3 to 0.45 as pits were gradually reduced in size as the discs were worn. A removable section in one of the discs made it possible to record the size and location of the surface defects by SEM-investigations before, during and after the test. For the tested pad/disc combination, there were no brake squeals generated as long as the friction coefficient was below a critical level of 0.4. The use of shot-blasted discs thus provides a unique possibility to investigate the correlation between brake disc topography, friction coefficient and brake squeal generation without changing neither the composition nor the macroscopic geometry of brake pad or disc.

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