Vibrating when step on brakes. on 1998 BMW 740i

Steering wheels is vibrating every time I step on brake pedal. I just have my brake pads and all rotors changed. What it could be the solution, pls advice.

Asked by for the 1998 BMW 740i
If you just had the brakes and rotors changed I would first ensure the wheel are tight. Pulsation felt in the steering wheel when braking is usually the rotors being out of true requiring re machining or replacement, but may also be a sign of worn suspension components. When the brakes are applied worn suspension bushings, wishbone bushings or track control arm bushings may contribute to vibration in the car up on braking. Should have been caught when the brake rotors were replaced.