If you wish to execute repairs on your own Vento Phantom R3 then it is usually a good plan to have a Workshop Manual to use as reference in case that you need to know methods to take out a specific part including Brake Pads and match it again effectively.
Vento Phantom R3 Workshop Manuals can offer you detailed diagnostic facts for your car so if something is broken it will help you understand what the situation is and ways to correct it. After that you can assess if this can be done by yourself or if ever the job is simply too big you can book your Phantom R3 in to a trusted mechanic.
Vento Phantom R3 manual