Front brake caliper centralising shim suitable for TR3-6 fitted with STD calipers. When fitting the caliper it is critical to ensure that the disc runs through the centre of the caliper and not biased to one side. Take a measurement from the disc face to the corresponding caliper piston and ensure both sides are the same. If the caliper is biased you may be required to fit one of these shims, each are 0.013" thick. Fit quantity as required.