If you wish to perform maintenance tasks for your Precision Cycle Works Nightmare then it is usually a good plan to own a Workshop Manual for personal reference if you need to know how you can take out a particular part like the Brake Discs and match it again the right way.
Precision Cycle Works Nightmare Workshop Manuals provides exact diagnostic guidelines on your automobile so if something is playing up it helps you discover what the issue is and how you can resolve it. You can then assess if this can be achieved by yourself or if ever the job is just too big you can book your Nightmare into a trusted car garage.
Precision Cycle Works Nightmare manual