If you choose to perform maintenance tasks to your TGB 303R then it is always a good plan to have a Workshop Manual to keep just for personal reference should you need to know the right way to take out a certain part for example, the Brake Pads and match it again safely.
TGB 303R Workshop Manuals are able to offer precise diagnostic information for your automobile therefore if something is wrong it can help you discover what the situation is and methods to fix it. Then you are able to evaluate if this can be achieved on your own or if ever the job is just too big you can still make a booking for your 303R into a nearby friendly mechanic.
TGB 303R manual