Need to replace the front brakes on my mk1 172 and have looked at previous posts and the DS2500 pads seem to be recommended. However people say they will wear the discs out quicker and wondered how quickly. I only do about 5000 miles a year so would they last a couple of years. I do not do any track days just road use. What would be the best discs to get with these pads? Is it important to replace brake fluid as I have never done this when replacing brakes before?