If you choose to do fixes to your Derbi DRD Pro 50 SM then it is always a good idea to have a Workshop Manual to use as personal reference in the event you need to know proven methods to take out a specific component for example Brake Pads and fit it again efficiently.
Derbi DRD Pro 50 SM Workshop Manuals offers clear particular diagnostic information for the automobile therefore if something is not working it will help you determine what the situation is and easy methods to make it better. Then you are able to determine if this can be done on your own or in case the job is just too big you could make a reservation for your DRD Pro 50 SM into a trusted repair garage.
Derbi DRD Pro 50 SM manual