What size tire?

Hello, I have a question. I am currently driving on summer tires with the size 265/30 ZR21 But now I need winter tires and the shop only shows me size 245/40 R19. Can I still use them? Or what do I need to be careful about? Currently, I don't even have a finger's width of…

According to the TÜV, the parking brake is not working on one side – what should I replace?

According to my garage, BOTH rear brake calipers need to be replaced, and possibly the brake cables as well. My question is: If the braking performance on one side was fine according to the TÜV, why do I need to have both brake calipers replaced?

Brake caliper paint: Which color for a black car? I need your opinion.

Hey community, I'll be replacing the brake discs and pads on my car next week with my colleague (a mechanic). So I'd also like to give my brake calipers a little paint, as they're not that noticeable anymore. What color would you choose for a black car? I don't want red—everyone has that. And yellow…