Cardone 54-77091 Power Brake Booster

Vacuum Power Brake Booster for Focus

The Cardone 54-77091 remanufactured vacuum power brake booster is built for 2009-2011 Ford Focus models that use a vacuum-assisted brake system and do not have a master cylinder included. It is re-engineered, tested, and finished to support OE-style fit and brake pedal response.

Cardone’s Vacuum Power Brake Booster line focuses on remanufactured brake boosters that are inspected for design improvements, then tested for fit and function before release. This approach helps deliver a replacement that matches the original application while adding durability-focused updates where applicable.

Key Features

• Remanufactured to match original equipment performance
• 100% tested for fit and function
• Single-diaphragm design with a 10.082 in. diaphragm diameter
• Steel construction with gray finish and rust-prohibitive coating process
• 100% O.E. quality seals and check valves installed
• Master cylinder stud thread size: M8 x 1.25
• Master cylinder output rods are pre-adjusted when included
• Package contents: booster, instruction manual, and M/C neck seal

Product Details

This Cardone power brake booster, part number 54-77091, is a remanufactured vacuum booster engineered for direct replacement in the Ford Focus brake system. It is built from steel, uses a single diaphragm, and is finished to resist rust while maintaining reliable vacuum-assisted braking performance. The unit is intended for 2009-2011 Ford Focus applications listed as lacking master cylinders, making it a focused solution for brake service on the correct vehicle platform. This part cross-references Ford 9S4Z2005A for the same application.

Common Brake Issues It Can Address

• Hard brake pedal feel from a weak or failing booster
• Reduced brake assist during normal stopping
• Vacuum leakage at the booster assembly
• Brake response inconsistency caused by worn internal seals or check valves
• Fitment problems when replacing an original booster with an incorrect unit

Installation Notes

Verify the vehicle is a 2009-2011 Ford Focus before installation and confirm the brake system does not require a master cylinder with the booster. Inspect the master cylinder neck seal and vacuum connections during replacement, and compare the stud thread size and mounting points to the original unit. Follow the included instruction manual and bleed the brake system if service procedures require it.

Quality Assurance

Cardone remanufactures this vacuum power brake booster to match OE performance, then tests each unit for reliable operation and proper fit. The design is reviewed for potential improvements, and durability-focused updates are applied where applicable before the part is released for service.