If you choose to do adjustments for your Piaggio Liberty 125 then it is usually recommended to possess a Workshop Manual for a reference if perhaps you need to know proven methods to take off a particular part for example, the Brake Discs and match it again accordingly.
Piaggio Liberty 125 Workshop Manuals are able to offer special diagnostic information on your car so if something is faulty it will help you find out what the situation is and the way to fix it. You will be able to evaluate if you can do this on your own or if the job is simply too big you can make a reservation for your Liberty 125 in to a trusted friendly mechanic.
Piaggio Liberty 125 manual