Shop BMW M6 Power Brake Booster. M40i. X3; 3.0L; w/o M, M Competition. X4; 3.0L; M40i. Brake Power Brakes—especially - OEM BMW Part # 34336889144 (34-33-6-889-144)

Brake. Booster. Power. Repair Kit UN.
Part has related component that cannot be reused/reinstalled; mount gasket. Power Brake Booster.

Power Brake Booster

Fits X3, X4

M40i. X3; 3.0L; w/o M, M Competition. X4; 3.0L; M40i.
Brake Power Booster Unit - Repair or Replace
If you have a brake pedal that is suddenly stiff or you hear a whistling noise when you step on your brakes—especially when you're stopped—the culprit may be a failed brake booster. Our technicians can easily diagnose a possible brake booster failure in your .