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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Brakes, Mechanical) >> Checking Perforated Rear Brake Discs (Wear Assessment) >> Visual Inspection For Cracks And Evaluating Cracks >> Notes

Visual Inspection For Cracks And Evaluating Cracks: Notes

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NOTE:
  • Perforation starter cracks arise through material fatigue due to frequent and extreme heat elongation fluctuations. These fluctuations in the disc temperature, which generally arise in racing conditions, tear the friction plate perforations in a radial direction due to material fatigue (changing heat elongation conditions). For their part, these starter cracks allow a partial relaxation of the friction plate, so that the speed at which the cracks develop is very slow.
  • The maximum permissible perforation crack length is 5 mm.
  • The growth of the perforation starter cracks or a tearing of the rim of the friction plate worsens the smoothness of braking, decreases the disc strength and therefore makes a precautionary parts replacement necessary.
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