An owner of an Atom recently experienced problems with run-out on brand-new front brake discs and could hear a dragging noise when the vehicle was jacked up and the discs rotated.
After much investigation the Atom owner discovered that the tolerances worked to by manufacturers are quite generous and when “stacked up” they cause a significant amount of run-out. Having searched the internet for a solution, the owner found a local garage providing a Pro-Cut brake disc skimming service. All four grooved discs were skimmed resulting in the removal of the run-out and braking massively improved. To read the full article, please go to the original article on the Atom Owners Forum website.