Cardone 54-77121 Power Brake Booster

Vacuum Power Brake Booster for Ford Fusion and Mercury Milan

Restore brake pedal assist with this Cardone remanufactured vacuum power brake booster, part number 54-77121. It is built to match original equipment performance and tested for fit and function, making it a direct replacement for select Ford Fusion and Mercury Milan applications.

Key Features

• Remanufactured to match O.E. performance
• Single-diaphragm design with a 10.325 in. diaphragm diameter
• Steel housing with gray finish
• 100% tested for reliable performance
• O.E. quality seals and check valves installed on every unit
• Rust-prohibitive finishing process for added durability
• Master cylinder output rods are pre-adjusted when included
• Guaranteed fit and function

Product Details

Cardone Vacuum Power Brake Booster 54-77121 is a remanufactured brake booster engineered for consistent vacuum-assisted braking response. It uses a single diaphragm design and includes a booster, instruction manual, and master cylinder neck seal. This unit does not include a master cylinder and uses an M8 x 1.25 master cylinder stud thread size. For drivers searching for a brake booster for 2010-2012 Ford Fusion or 2010-2011 Mercury Milan lacking master cylinders, this part provides an OE-style replacement built to restore pedal feel and braking assist.

This part cross-references Ford and Lincoln applications under OE number AE5Z2005B for the same application.

What It Helps Address

• Hard brake pedal feel
• Reduced vacuum brake assist
• Inconsistent braking response
• Brake booster leakage or internal diaphragm wear
• Fitment issues from a worn or failing original booster

Installation Notes

Verify vehicle fitment before installation and confirm the application is for vehicles lacking master cylinders. Inspect the master cylinder neck seal and related vacuum connections during replacement. The master cylinder output rod is pre-adjusted when included, which can reduce setup time, but final installation should still follow the service manual for the vehicle.

Quality Assurance

Cardone remanufactured power brake boosters are re-engineered, built, and tested to match original equipment performance. Each unit is 100% tested to confirm fit and function, and the design includes O.E. quality seals, check valves, and a rust-resistant finish to support long-term reliability.