SHIM DESIGNS

Various shims and springs are used to reduce brake pad vibration and noise. Not all of them look the same, although they perform the same task. Ensure that damaged parts are replaced in their intended positions. Do not modify them.

1 These pads are fitted to a rear hydraulic disc and have their movement limited by a spring-loaded clip that applies pressure between the fixing bolt and the caliper body.

2 Many pads are fitted with separate metal shims on their reverse sides, although some types are fitted with a rubber-type coating (as pictured in Step 13 on page 11). Metal shims deteriorate over time, so replacing them is not wasteful.

3 The brake disc, fitted to this rear sliding caliper, is secured by a spring-clip that locates into the middle of the piston. Note the thin metal shim that is integral with the pad.

4 On this rear brake caliper, pad movement is restricted by a springloaded clip that applies pressure to the pad, caliper and slider.

5 The pads’ integral springs on this front sliding caliper application bear against the caliper body, once it has been lowered into position fully.

6 Some pads feature a rubber-based noise/ vibration suppression agent. Here, the back of the pad is coated at the points where the outer part of the caliper makes contact.