If you wish to undertake repairs to your Hyosung RT125D then it is usually a good plan to have a Workshop Manual to keep just for reference in case that you want to know methods to take out a specific part including Brake Pads and fit it again perfectly.
Hyosung RT125D Workshop Manuals provide you with detailed diagnostic details on your car so if something is not working it helps you identify what the problem is and easy methods to make it better. Then you are able to decide if this can be achieved on your own or that the job is simply too big you could make a reservation for your RT125D in to a suitable car garage.
Hyosung RT125D manual