RE: Postage !!!!
The brake disk is mounted on the drive cup. It has two flat spot that lock it to the drive cup. So if you are turning the wheels and the fiber disk does not move but the cup and dog bone are moving it means it has rounded out the fiber disk and you need a new disk. The replacement brake kit is redcat part number 02044 It comes with 2 brake disks, 4 pads and 4 screws.