Rear Brake Caliper Rebuild Kit - FTO Caliper service kit for Rear Brake Caliper. 30.1mm Piston in an FTO Rear Caliper sometimes has been aftermarket fitted to an EVO 123 This kit is more comprehensive than the OEM Rebuild Kit as it also contains new metal slider sleeves. Stripping down and rebuilding a brake caliper should only be attempted by someone competent. For Exploded Diagram Click HERE Mitsubishi Part Number MB857874