Disc thickness variation (DTV) generated during off-brake phases due to non parallel brake discs and pads or manufacturing tolerances of the brake disc can lead to undesirable effects for example; brake force variation or judder in the brake system. Where many ECE friction materials with a higher disc wear are able to recover from DTV, usually NAO’s don’t possess this ability or not to a sufficiently high degree. Thus, it is crucial that DTV is not generated in the first place.

Plenne, Ilja*,, TMD Friction, Germany