A1 CARDONE VACUUM BRAKE BOOSTER, REMANUFACTURED -- Without master cylinder; Includes bleeder kit, essential hardware, and complete easy-to-follow instructions; Manufactured with exclusive rust-prohibitive finishing process to extend on-car and on-shelf life; Bores are fine-tuned to OE microfinish; Rubber components are of EPDM classification; Features 100 percent OE quality seals, diaphragms, and check valves for OE performance and reliability; Has undergone stringent quality control in all stages of manufacturing.