If you need to execute auto repairs on your own Suzuki KingQuad 400FS then it will always be a good plan to have a Workshop Manual to use as personal reference in case that you need to know how you can take out a certain part for example the Brake Pads and match it again in the correct manner.
Suzuki KingQuad 400FS Workshop Manuals will give particular diagnostic guidelines for the automobile so if something is not working it will help you figure out what the issue is and some ways to repair it. After that you can decide if this can be achieved by yourself or if ever the job is just too big you can still book your KingQuad 400FS into a decent mechanic.
Suzuki KingQuad 400FS manual