If you want to carry out maintenance tasks for your MZ Classic 300 then it is usually recommended to own a Workshop Manual to keep just for personal reference in the event that you need to know simple methods to strip off a particular part much like the Brake Discs and install it again accurately.
MZ Classic 300 Workshop Manuals will provide you with unique diagnostic info for the car or truck so if something is broken it can help you work out what the issue is and the best way to repair it. Then you are able to assess if you can do this on your own or if the job is simply too big you can actually make a booking for your Classic 300 in with a nearby garage.
MZ Classic 300 manual