Boot kit. Front. Left. Right. A rubber Boot used to protect the disc brake Caliper guide pin from dirt, debris and moisture to prevent corrosion. Disc Brake Caliper Repair Kit. Disc Brake Caliper Seal Kit. Incl.Guide Pin Boot,Piston Boot,Seal,Bleeder Cap. AND Set,. Disc Brake Slide Pin. Guide pin Cap. Repair. Included with: Caliper.