If you wish to execute maintenance on your own Vespa GTS250 ie ABS then it is always a great idea to own a Workshop Manual for reference just in case you want to know tips on how to take off a particular component like the Brake Discs and fit it again in the correct manner.
Vespa GTS250 ie ABS Workshop Manuals are able to offer exact diagnostic details for the automobile so if something is playing up it helps you ascertain what the issue is and some ways to repair it. You will be able to analyse if this can be done yourself or if ever the job is simply too big you can actually make a reservation for your GTS250 ie ABS in with a trusted mechanic.
Vespa GTS250 ie ABS manual