Disc thickness variation Archives - Brake & Front End
Runout And DTV: Decreasing Comebacks With Two Simple Tools

Even if you use new rotors, your chance of a pulsation comeback could be greater than if you left the old rotors on the vehicle. Runout in the hub and new rotor can stack up to cause disc thickness variation (DTV) in a few thousand miles. DTV is the main cause of pulsation.

Finding, Fixing Runout and Disc Thickness Variation

Now that the warped rotor myth is busted, and we’re not just replacing the rotor and moving on, what are we doing instead? Measuring runout First, check for rotor surface runout with the wheel mounted. Components should be marked as you perform an inspection of the assembly. By measuring the rotor on the hub, you

on the car brake lathe
Stop the ‘Warped’ Rotors Myth and Service Brakes the Right Way

Myths take hold ­because either A) they seem completely logical or B) they are so often repeated that they just become common knowledge. The warped rotor myth is a little bit of both. A rotor that contributed to a pulsation condition certainly appears “warped.” Plus, everyone says it — even technicians that know the rotor

brake rotor runout