If you want to conduct auto repairs for your Aprilia Sonic 50 GP then it will always be a great idea to have access to a Workshop Manual for a guide in the event you want to know how to take out a particular component for example Brake Pads and fit it again in the right way.
Aprilia Sonic 50 GP Workshop Manuals gives you specified diagnostic details for your car therefore if something is not working it will help you ascertain what the problem is and how you can fix it. After that you can evaluate if this can be done yourself or in case the job is simply too big you can book your Sonic 50 GP into a nearby repair garage.
Aprilia Sonic 50 GP manual