If you have to conduct fixes on your own Ducati Monster S4 then it will always be a good idea to possess a Workshop Manual for reference in the event you want to know the right way to strip off a particular component for example the Brake Pads and install it again perfectly.
Ducati Monster S4 Workshop Manuals gives you targeted diagnostic guidelines for your vehicle so if something is not working it will help you work out what the problem is and easy methods to fix it. You can then decide if this can be achieved on your own or if the job is too big you can make a reservation for your Monster S4 into a suitable garage.
Ducati Monster S4 manual