Q: I bought my car to the mechanic to replace the shock absorbers. While working, he noticed that the brake discs were going, and he replaced them as well, without asking authorization. Must I pay for that repair, or can I say: “Return the old discs!”?
A: Since the discs were going, this is considered a situation of “fit for such enhancement.” Therefore, although the mechanic did not ask for your authorization, it is no worse than yored l’sedei chavreiro.
We mentioned that the Rishonim dispute whether the owner can say, “Take your wood and stones,” for a property fit for such enhancement (C.M. and Gra 375:2; Sma 375:4).
Moreover, it seems that you would be merely seeking an excuse and would not be believed that you really want the old discs (Chazon Ish 375:2).
Furthermore, it is not realistic to remove the enhancement (Nesivos 375:2).
Thus, the mechanic is entitled to the going-rate for such repair — not necessarily his regular rate, even if it were more expensive.
