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