Important Product Bulletin
Shimano has recently learned of a potential quality issue riders may encounter using the model BR-M485 disc brake calipers. Shimano received some calls regarding concerns over traces of oil found on new caliper bodies. Please note the following information and procedures regarding this issue.
Mineral oil on BR-M485 calipers
2. If you see traces of oil on the caliper body, you should also check the brake pads and rotors for oil contamination. If the pads are contaminated, you may experience some noise and poor braking power. If the pads are contaminated with oil, clean the caliper and replace the brake pads. If the rotor is also contaminated with oil, wipe it off with a clean rag using rubbing alcohol.
If you notice any oil on the calipers in the marked areas (see photos), this does not necessarily mean that the brake is leaking. There is an O-ring seal between the two halves of the caliper. When the brake is assembled, there may be oil between these two halves. This oil is pressed out when the brake is operated the first time. The oil will soon stop emerging.
Please take the following steps:
Should you have any questions or concerns regarding this issue, please call us or Shimano's service line for assistance at Shimano American 800-423-2420.