Bicycle disc brakes operate with very tight tolerances. This leaves little room for error. If you occasionally hear brake friction, this is either a sign of a bent disc, or the brakes need service or an external influence. In such situations, you will need the Disc Brake Calliper Alignment Tool. It is not difficult to guess how to use it with the help of our photos. Order the Disc Brake Calliper Alignment Tool to repair your bike brake system. In addition, you can find Tire Repair Kits (Bicycle Camera Patches) in our catalog Bicycle Tools, Wrenches & Sets. This kit is also indispensable for repairing your bike.