It's time I replace the rotors and pads on my 850. I didn't get a big brake kit, but I am stepping up to cross drilled rotors. I am also planning on painting the calipers to make the new setup look more fresh. I haven't done this before but have printed out a few good instructions with pictures and helpful hints. <p>My question is this. How do I know how many shims to use in the install? Do I compare it to what is originally there, or is there a better easier way to judge this? Any other helpful suggestions would be greatly appreciated.