OK, retyping had a glitch....augh!!!!!
OK, to get the best KLR brakes I know of...here are my recomondations.
Buy the 320 disc with it's adapter plate, I suggest the most expensive EBC one, but many have had success with the cheaper versions, now get stainless steel line, now go to fleabay and look for a V-Strom front caliper 2005 ish, buy a set if you can cheap, they shouldn't need rebuilding imho. If you can't get a set then just the left is good. To mount the caliper to the adapter plate is a simple adapter plate to match the two together, easy flat steel or Alluminium plate, it is easy...now use the SSline, it all bolts together, to your stock master. IF you want to go to the next stage, buy a 2005ish again CBR600RR or CBR1000RR master, it bolts on and onto the same line. It is completely adjustable for gravel/dirt riding as well as full on street riding. Now if you bought a set of caliers you install the right on on the back, a simple grinding of the mounting plate and redrilling the top hole will mount it. The expensive part will be getting a new SS line made up because the stock one if I remember correctly is too short.
I never in a million years thought you would need better rear brakes on a KLR but the differance is amazing! You do not need to apply as much pressure and you can feel the brake far better with this set up.
I have not seen or heard of a better braking sytem yet on a KLR. I have as close to street bike braking as I can imagine......it's fantastic!!!!
OH I also use the cheapest soft pads I can find and they are like $14 a pair for this set up!