Cardone 53-2686 Power Brake Booster

Vacuum Power Brake Booster for BMW

Cardone 53-2686 is a remanufactured vacuum power brake booster built for BMW applications that require OE-style fit and braking assist. It is re-engineered, tested, and finished to support reliable pedal response in BMW 323i, 328i, 330i, M3, and Z4 applications.

The Cardone Vacuum Power Brake Booster line focuses on restoring factory-style brake assist with remanufactured units that are checked for fit and function. For BMW owners, this means a direct replacement path for vehicles listed below, including 2001-2006 BMW 325Ci and 330Ci models and 2003-2008 BMW Z4 applications.

• Remanufactured to match OE performance
• 100% tested for reliable fit and function
• 100% OE-quality seals and check valves installed
• Exclusive rust-prohibitive finish for added durability
• Single-diaphragm design with 10.451 in. diaphragm diameter
• Steel construction with gray finish
• Master cylinder stud thread size: M8 x 1.25
• Package contents: booster, instruction manual, and M/C neck seal

This part cross-references BMW 3433758691 and 34306775989 for the same application. Cardone 53-2686 is a remanufactured power brake booster engineered for BMW braking systems that use vacuum assist and do not include a master cylinder with the booster assembly.

Vehicle Fitment

• Fits 2003-2008 BMW Z4, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2006 BMW 325Ci, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2006 BMW 330Ci, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2004-2006 BMW M3, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2005 BMW 320i, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2005 BMW 325i, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2005 BMW 325xi, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2005 BMW 330i, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2001-2005 BMW 330xi, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2000 BMW 323Ci, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 1999-2000 BMW 323i, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 2000 BMW 328Ci, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.
• Fits 1999-2000 BMW 328i, N/A; vacuum power brake booster; fits vehicles lacking master cylinders.

What It Helps Address

• Hard brake pedal feel from a failing vacuum booster
• Reduced brake assist during normal stopping
• Brake response issues caused by worn internal seals or check valves
• Fitment problems when replacing an OE BMW booster
• Corrosion-related booster deterioration

Installation Notes and Tips

Verify the vehicle application before installation, especially because these fitments are listed for vehicles lacking master cylinders. Confirm the master cylinder stud thread size is M8 x 1.25 and compare the diaphragm style and diameter to the original unit before removal. The included instruction manual and M/C neck seal support a cleaner replacement process.

Quality Assurance

Cardone remanufactures this brake booster to OE performance standards and tests every unit for fit and function. The booster is re-engineered with OE-quality seals and check valves, then finished with a rust-prohibitive coating to help extend service life.