If you choose to do fixes on your own Vespa LX 50 4T then it is usually a great idea to own a Workshop Manual to keep just for a guide just in case you want to know how to strip off a particular part including Brake Discs and fit it again appropriately.
Vespa LX 50 4T Workshop Manuals will provide you with detailed diagnostic information with regards to your automobile so if something is wrong it will help you ascertain what the issue is and the best way to repair it. After that you can assess if this can be achieved by yourself or if ever the job is too big you can make a booking for your LX 50 4T in to a nearby repair garage.
Vespa LX 50 4T manual