If you want to undertake fixes for your Kawasaki ZZR 400 then it is always a great idea to have a Workshop Manual for personal reference in the event that you want to know how you can take out a particular part including Brake Pads and match it again in the correct way.
Kawasaki ZZR 400 Workshop Manuals gives you specified diagnostic info for the car therefore if something is not working it helps you ascertain what the problem is and the way to repair it. After that you can decide if this can be achieved yourself or in the event the job is too big you can make a booking for your ZZR 400 right into a decent car garage.
Kawasaki ZZR 400 manual