Steering wheel shimmy after pad change on my C300, is that a bedding issue or did they mess up?

[oliviawilson]

Picked up my 2020 C300 from a garage in Al Qusais yesterday evening after having the front pads and sensors replaced and I was actually pretty happy with the price until I hit the highway and noticed a slight vibration through the steering wheel when I brake from about 100kmh, nothing violent but enough to make my morning commute on Sheikh Zayed Road feel a bit less refined than usual. The car stops straight and there's no pulling or weird noises it's just that faint shimmy that's driving me nuts because it wasn't there before the pad swap and now I'm second guessing whether I should have just gone to someone who deals with these cars day in and day out instead of the general shop near my office. I've been reading that some pad compounds need a proper bedding procedure to transfer material evenly onto the rotors and I'm hoping that's all this is but part of me is worried they didn't clean the hub surface properly or maybe torqued the wheels down unevenly with the impact gun. I saw a post on another forum where someone mentioned that Mercedes brake pad maintenance specialists Dubai actually take the time to measure rotor runout and clean the contact points before installing anything new and honestly that level of attention sounds like exactly what I'm missing right now. Has anyone else had a similar shaky brake pedal for the first hundred kilometers and it just smoothed out on its own or should I take it back and ask them to redo the seating before my rotors end up with permanent deposits that make me hate driving the car?