If you wish to execute maintenance on your Sachs Eagle 50 then it is usually recommended to have access to a Workshop Manual for reference in case that you want to know methods to take off a specific part like the Brake Discs and match it again adequately.
Sachs Eagle 50 Workshop Manuals provide you with specific diagnostic information on your vehicle therefore if something is faulty it helps you identify what the situation is and some ways to correct it. After that you can decide if this can be achieved on your own or in case the job is simply too big you are able to book your Eagle 50 in to a nearby repair garage.
Sachs Eagle 50 manual