Brakes and warranty?

Hello, have my Mondeo tournament now almost a week. Is a used with 49500km BJ. 2001. I now have the sorry problem that my brakes (back) start to squeak. Stop then mostly and drive a little bit back and brake. Helps in most cases for a certain time. Here in the forum I read that there is a TIS for this. My question is how to behave now. I have concluded an annual guarantee with the dealer via the BVFK (Bundesverwaltung) I have to call the dealer directly. Have the car not yet a week and would (if it is possible) threaten to kick him back from the delay because this is a hidden defect. Driving is unfortunately difficult because the dealer is located 250km away. Or is it better to drive to a local Ford dealer and analyze the problem more closely? Or just call the BVFK directly? Please give me some advice, I’m pretty sure you’ll find the right answer. Unfortunately, a repair at my expense is out of the question this month.