I just bought a used 2014 with 84,000 miles. The dealer said the brakes had just been replaced and rotors inspected. When breaking at around 35mph and up, the car is doing a tiny swerve/wiggle and then goes back to normal. There's no shaking and it stops fine. The car still drives very smoothly when it happens. I have a warranty that I purchased at the dealership that should cover it if I need to have something fixed, but it doesn't cover the diagnostic, which is $130 an hour. Does anyone have any ideas about what would cause this? My appointment is 2 weeks from now and I'm wondering if this might be a safety issue at all until then. Even though the swerve is tiny, it's very disconcerting because for 1 second you feel like your losing control of the car.