If you wish to do auto repairs on your own Moto Guzzi V 50 III then it is usually a good idea to have a Workshop Manual to use as reference in the event that you want to know easy methods to strip off a certain component for example Brake Pads and fit it again efficiently.
Moto Guzzi V 50 III Workshop Manuals will give you special diagnostic guidelines for the car therefore if something is wrong it will help you identify what the situation is and tips to correct it. You can then analyse if this can be achieved on your own or in the event the job is simply too big you could make a reservation for your V 50 III right into a local garage.
Moto Guzzi V 50 III manual