If you want to conduct adjustments to your Ducati ST4 then it is usually a great idea to possess a Workshop Manual to use as personal reference just in case you want to know the best way to take off a certain part such as the Brake Pads and fit it again appropriately.
Ducati ST4 Workshop Manuals provide you with certain diagnostic information for your car or truck so if something is broken it will help you discover what the problem is and the best way to fix it. After that you can determine if you can do this on your own or if ever the job is too big you can book your ST4 in to a nearby garage.
Ducati ST4 manual