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What are the advantages of a cross-drilled, vented rotor versus a stock vented rotor?


4/7/2009

What are the advantages of a cross-drilled, vented rotor versus a stock vented rotor? I recently had a customer return a pair of stock rotors for his truck because "they just won't stop it". My common sense tells me that a cross-drilled rotor has less surface area for the brake pad to grab, therefore less stopping power. The only advantage I could see with a cross-drilled rotor was the ability to dissipate heat more efficiently. The guy had some kind of 36-inch lift if that has anything to do with it.
 
Cross-drilled rotors are claimed to run as much as 100 degrees F cooler
than regular rotors. The advantage is most evident when towing trailers and
descending long grades. Apart from those extreme conditions, you're right,
less surface area, less friction.

Jim O'Neill
Chino Autotech Inc., Auto Club SoCal AAR
SAE Int'l SoCal Section Board of Governors
Vice Chair, Service Technology Programs
NASTF Service Information/Communications Committees
Auto Value/Bumper-To-Bumper CSC Nat'l Council
ASE CMAT-L1, CA. Smog Check Technician
AMI AAM Accredited Automotive Manager












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