This happened a few times where cruising at highway speeds, 60-70 mph, it seems the front brakes will start to drag, slowly slowing the bike, which causes me to pull over to the side of the road. What leads me to think its the front brakes, is that laying off the throttle, the bike will dive a little forward; more than when you normally lay off the throttle would, and it will still slow after I open the throttle a little more. A couple times it has locked up once I have stopped and I need to push the brake lever fully forward to get it to unlock. When it happens though, I have never used the front brakes previously and would have been cruising for some time. Afterwards it doesn't do it again and the front brakes work just fine. Would this be a caliper issue or would it be in the master cylinder??? This is the first time working on a bike so Im looking for some guidance. It's a 2005 ZX6R 636 and the previous owner has steel braided brake lines installed in the front if that helps any. Any suggestion will be greatly appreciated. Thanks!!!