Originally Posted by Can't Know

Actually, cleaning the rotors before installation is typically suggested. A good strong solution of dawn dishwashing liquid works well to clean off the film of oil often left to prevent corrosion, as well as being sure skin oils, etc. are washed off.

James, if you haven't been braking much in 400 miles, then you wouldn't expect to see many changes. For you that might be more like 1,000 or 1,500 miles.

That said, if you're due for a flush I'd do that anyway as Larry has suggested.

Good luck.