If you have to accomplish auto repairs to your BMW R 505 then it is always recommended to own a Workshop Manual for reference if you want to know the best way to strip off a particular part such as the Brake Discs and match it again efficiently.
BMW R 505 Workshop Manuals offers clear unique diagnostic guidelines for your automobile so if something is broken it helps you determine what the situation is and some ways to resolve it. Then you are able to determine if this can be done on your own or in case the job is just too big you can still make a booking for your R 505 into a suitable repair garage.
BMW R 505 manual