If you want to conduct maintenance tasks for your Derbi GPR 125 Racing then it is always a good plan to own a Workshop Manual to keep just for personal reference in the event that you need to know how you can take out a certain component including Brake Pads and match it again adequately.
Derbi GPR 125 Racing Workshop Manuals offer you exact diagnostic guides for the car therefore if something is playing up it can help you discover what the problem is and the way to resolve it. After that you can determine if this can be done yourself or in case the job is simply too big it is possible to book your GPR 125 Racing in to a local car garage.
Derbi GPR 125 Racing manual