If you wish to execute maintenance for your Derbi Senda XTreme 50R then it will always be a good plan to have access to a Workshop Manual to use as a guide should you need to know the best ways to take out a specific component for example, the Brake Discs and match it again accordingly.
Derbi Senda XTreme 50R Workshop Manuals can provide distinct diagnostic guides on your automobile therefore if something is broken it helps you work out what the situation is and the best way to fix it. After that you can evaluate if this can be done yourself or in case the job is too big you can make a booking for your Senda XTreme 50R in with a suitable garage.
Derbi Senda XTreme 50R manual