55-64 Thunderbird Front disc brake conversion kit with power brake booster and master cylinder. This is a complete front drum to disc brake conversion for the Thunderbird. Our most popular Thunderbird kit offers great stopping at and affordable price. For 55-57 you will need to relocate the battery to the trunk to allow room for the new power brake booster master cylinder. The 56 and 57 came with 15 inch wheels and they will work great with the kit. The 1957 came with 14 inch wheels, some slight grinding to the caliper may be needed to fit the stock 14 inch. For 58-60 14 inch wheels are fine. For 61-64 you will need 15 inch wheels.