If your Corvette has lost that positive toe-touch braking it once had, your aging 1984-1991 Corvette Power Brake Booster could be cause. Replacing your faulty booster with a new unit will give you a firm, positive pedal effort while improving your driving confidence and safety. Our 1984-1991 Corvette Power Brake Boosters restore brake safety and convenience. If you hear a hissing (vacuum leak) near the master cylinder and firewall, or if you must force the brake pedal down, it's time to replace worn power brake booster with a new unit. Unlike the plastic OE unit, our Replacement Power Brake Booster for 1984-1991 Corvettes is manufactured with a metal zinc cadmium-coated housing.