The 54-74000 Vacuum Power Brake Booster is a steel component designed specifically for Mercury Zephyr (1978-1983) and Marquis (1983-1986) models. It includes the booster itself and an instruction sheet for easy installation. This OEM part carries a 5-year manufacturer warranty, ensuring quality and durability. With a housing diameter of 8.74 inches and stud thread size of 3/8x16, this brake booster is a genuine replacement part that fits the specified vehicles.
