2016-2019 BMW 7 Series Brake Booster 29688109401
Specifications
OEM number
29688109401
Donor year
2016
Body style
Sedan
Fuel
Gas
Engine size
4.4 L
Transmission
Auto
Drivetrain
AWD
Suspension
Air
Trim
Xdrive m package
Donor mileage
87000
Paint code
A89 Imperial Blue Brilliant Effect
About this part
Also known as
Power Brake Booster
Brake Servo
Vacuum Booster
Power Brake Assist Unit
Brake Amplifier
What this part does
The brake booster multiplies the mechanical force applied to the brake pedal, using engine vacuum or an auxiliary vacuum pump to assist the driver in stopping the vehicle. It is mounted directly to the driver-side firewall, sitting between the brake pedal linkage and the master cylinder. When the internal diaphragm tears or the unit fails, the brake pedal becomes completely stiff and requires immense physical leg pressure to slow the car down. A compromised seal inside the booster can also create an engine vacuum leak, which frequently triggers rough idling or stalling when the brakes are applied.
Fits these vehicles
| Make | Model | Years | Engine |
|---|---|---|---|
| BMW | 750i xDrive | 2016-2019 | 4.4L |
| BMW | 750i | 2016-2019 | 4.4L |
OEM and interchange numbers
29688109401
296881094
Before you order
Confirm your original 11-digit part number matches 29688109401 exactly. BMW uses multiple different boosters for the 7 Series chassis depending on whether the vehicle is equipped with specific driver assistance packages, active cruise control (Stop & Go), or integral active steering. Before replacing the assembly, inspect your vacuum line and the one-way check valve, as a split line produces the exact same hard-pedal symptom as a failed booster. When installing, check your existing master cylinder for rear seal leaks; brake fluid pooling inside the booster housing will rapidly destroy the new diaphragm.
