If you want to undertake maintenance for your Suzuki GN 400 L then it is usually a good idea to own a Workshop Manual to keep just for personal reference should you want to know the way to take out a certain component including Brake Pads and match it again safely.
Suzuki GN 400 L Workshop Manuals will provide you with specific diagnostic details for the car or truck therefore if something is wrong it can help you find out what the issue is and the best way to repair it. You will be able to determine if this can be done on your own or that the job is just too big you can still make a reservation for your GN 400 L into a nearby car garage.
Suzuki GN 400 L manual