If you have to accomplish adjustments to your Norton Commander then it is always recommended to have a Workshop Manual to keep just for reference should you want to know tips to remove a certain component like the Brake Discs and fit it again perfectly.
Norton Commander Workshop Manuals are able to offer identifiable diagnostic facts for your vehicle so if something is not working it will help you determine what the issue is and how you can correct it. You can then assess if this can be done yourself or if ever the job is too big it is possible to make a booking for your Commander right into a trusted repair garage.
Norton Commander manual