If you choose to execute adjustments on your own Vespa LX 50 Navy then it is always recommended to possess a Workshop Manual to use as personal reference in case that you want to know the best ways to remove a certain component much like the Brake Pads and match it again in the right way.
Vespa LX 50 Navy Workshop Manuals are able to offer detailed diagnostic details for the car so if something is not working it can help you ascertain what the problem is and some ways to repair it. You can then analyse if you can do this on your own or if ever the job is just too big you can still book your LX 50 Navy into a trusted garage.
Vespa LX 50 Navy manual