Visual Inspection Of The Surfaces Of The Brake Disc Friction Surfaces (Indication Of Wear)

Information 

• The friction surface changes occur due to material fatigue as a result of extremely high thermal load. These disc temperatures, which occur above all in racing conditions, cause a progressive material fatigue. 
• Effects on driving: The surface change worsens the smoothness of braking, decreases the disc strength and increases the brake pad wear and therefore makes a precautionary parts replacement necessary. 

The following illustrations (PCCB brake disc wear appearance) are to be used for damage assessment.

PCCB brake disc wear appearance 

1. Friction surfaces after normal brake load while driving on roads. No surface fractures present -

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   Bores (perforations) in brake disc friction surface

   No replacement necessary!

2. Friction surfaces after a long run and occasional higher load. Isolated cases of connected surface fractures less than 1 cm²-arrow-  .

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   PCCB surface fractures

   No replacement necessary as the associated surface fractures are < 1 cm² !

3. End of service life of friction surface or after highest load on a racing circuit.

Replace brake discs if the connected friction surface damage is > 1 cm²-arrow-  . To do this, follow the instructions provided under

> 465102 Checking front PCCB brake disc (wear assessment) - section on "INFORMATION "

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Associated surface fracture

The best way to detect a surface fracture is by checking the wear indicators. Based on the wear indicators, this means that at least one wear indicator -arrow-  must have a surface fracture of > 50% (damage > 1 cm² /entire surface of a wear indicator with a surface area of approx. 2 cm² ).

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PCCB surface burnout on wear indicator