Carrier assy bushing kit. Front. Left. Right. A Bushing, typically made of rubber, used to provide a surface for the disc brake Caliper guide pin to move freely. A Kit containing disc brake Caliper guide pin boots. A rubber boot used to protect the disc brake Caliper guide pin from dirt, debris and moisture to prevent corrosion. Disc Brake Bushing. Disc Brake Caliper Bushing. Disc Brake Caliper Pin Seal. Included with: Caliper, Caliper assembly, Caliper mount, Carrier assembly, Part is included with Carrier assembly.