2013 Chrysler 200 Touring 186k miles. 3rd owner.

My Chrysler has started having a shudder in the pedal when braking. It only has the shutter at 10 mph when lightly braking, at 15 when braking a little harder than normal, and today I had to slam on the brakes because of a vehicle in front of me and the pedal shuddered (I can literally feel the pedal shudder under my foot) with a loud knocking sound coming from the front. It’s been in the shop where it got all new rotors and pads all the way around. Just replaced a brake line and a caliper hoping that was it but the shudder is still there. HELP IM 2 grand in the toilet and nowhere closer to knowing what to actually fix.