Can understand that. I was doing a brake strip down on my 7 year old B9 A4 with 60k miles in the summer and carrier bolts were seized solid. Tried an air gun and spanner and jack approach, but no success. Because of their location it’s difficult to get a breaker bar on them, unless the car is lifted. In the end, bought new bolts from Audi and got local garage to remove the old ones. Fitted new bolts with a smear of anti seize ceramic paste.