There are 2 owner-reported brakes complaints for the 2004 BMW 6 Seriesin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2004 BMW 645CI. THE CONTACT STATED THAT THE VEHICLE WAS REPAIRED UNDER NHTSA CAMPAIGN ID NUMBER 10V446000 (SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM). THE CONTACT STATED THAT A YEAR AFTER THE REPAIRS WERE COMPLETED, A BRAKE FAILURE OCCURRED AND THERE HAD NOT BEEN A FAILURE PRESENT BEFORE THE VEHICLE WAS SERVICED UNDER THE RECALL. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS CONFIRMED THAT THE MASTER CYLINDER AND BOOSTER HAD FAILED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS CONTACTED ABOUT THE ISSUE. THE FAILURE MILEAGE WAS 150,000 AND THE CURRENT MILEAGE WAS 150,100. UPDATED 02/20/13*LJ UPDATED 02/20/2013 *JS
TL* THE CONTACT OWNS A 2004 BMW 645CI. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 30 MPH, THE BRAKE PEDAL WAS APPLIED; HOWEVER THERE WAS NO RESPONSE. THE CONTACT REPEATEDLY ENGAGED THE BRAKE PEDAL AND THEN ENGAGED THE EMERGENCY BRAKE. THE VEHICLE CAME TO A COMPLETE STOP. THE VEHICLE WAS THEN TAKEN TO AN INDEPENDENT MECHANIC, WHO STATED THAT THERE WAS A RECALL ASSOCIATED WITH NHTSA CAMPAIGN ID NUMBER 10V446000 (SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM). THE VEHICLE WAS THEN TOWED TO AN AUTHORIZED DEALER AND THEY STATED THAT THE POWER BOOSTER WOULD NEED TO BE REPLACED. THE DEALER WOULD NOT HONOR THE RECALL FOR AN UNKNOWN REASON. THE VEHICLE HAD NOT BEEN REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 90,000. THE VIN WAS UNAVAILABLE.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026