I was talking about the disks, sorry I didn't make that clear. If the rust is too extensive then the car will fail its periodic test. All cars in Norway must

I was talking about the disks, sorry I didn't make that clear. If the rust is too extensive then the car will fail its periodic test. All cars in Norway must be tested every two years (first test when the car is four years old) and the condition of the brake disks is one of the check points. I agree that the pads will last much longer with regen but the pads are relatively cheap compared to the disks.