Left.2WD. Right.2WD. A bolt used to Mount / lock the disc brake Caliper to the disc brake Caliper guide Pin. A Pin used with a float style Caliper, which Mounts the Caliper to a Caliper bracket through a Caliper guide Pin bolt, allowing the Caliper to slide freely during braking. Pin Kit. bushing. Split. support retainer. Disc Brake Guide Bolt. Disc Brake Slide Bolt.