Using your AS3 Performance rear brake disc is straightforward. Just install it according to the standard procedure for your Kawasaki KX 85, KX 100, or KX 112. For optimal performance, it's a good idea to use AS3 Performance brake pads as recommended. When you're riding, you'll notice the great braking power this disc provides. As for maintenance, keep an eye on the ventilation slots. Make sure they're not blocked by dirt or debris, as this helps keep the disc cool and clean. Check the disc regularly for any signs of excessive wear. If you see anything unusual, it might be time to replace the disc. Remember, this brake disc comes with a 12 - month warranty, so if there are any issues within this period, you're covered.