Trouble Shooting Brake Rotor Problems
Description of the defect: Disc shows coloring of varying intensity and shades (blue, violet, golden), mainly visible in the cooling areas (groove and carrier interior).
Consequences: Initial slight vibrations that progressively increase. Overheating of this type alters the mechanical characteristics of the cast iron in as much as there is change in structure due to the formation of cemmentite (Fe³ C).
Advice: Always advise users to observe a running in period. Brake only moderately and briefly during the first 200-300 kilometers over a mixed itinerary. Avoid prolonged pad to disc contact.
No Running In
Photos Reproduced From: The Brake Disk Manual by Brembo, author Jean-Paul Pompon and coordinating editor Marc Aguettaz