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Brake Rotor Burnishing

Published by Mark Link
Friday, April 29, 2011

Recommendation: Always advise your customers/clients to observe a running in period.

Street Duty
Brake only moderately and briefly during the first 200 miles over a mixed itinerary. Avoid prolonged pad to rotor contact.

Race Cars

To break in your rotors make 12-24 progressively harder decelerations, making sure not to bring the rotor to over 700 degrees Fahrenheit . Don’t drag your brakes. After your rotors have cooled completely inspect them for a smooth surface. Look for any localized brake pad material buildup. If buildup is found have the rotors machined or replace them, as buildup can cause brake judder.

Repeat the above process once your rotors are completely cooled. This procedure thermally conditions your rotors and will reduce the possibility of thermal shocking.

Heavy Use (Police, Ambulance, and High Performance)
Have Technicians make 5 decelerations from 70 to 50 mph. Firm on the brake pedal. Drive approximately two or three miles to cool brakes then make 5 more decelerations from 70 to 40 mph. Firm on brake pedal. Don’t slam on brakes. Again, drive approximately two or three miles to cool brakes and then make 5 more decelerations from 70 to 30 mph. Cool brakes for two or three miles then park car and allow brakes to cool completely. When brake rotors return to ambient temperature repeat this entire process one more time. The brake rotors are how burnished and are ready for service!


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