My 1999 K1100LT has just started showing a problem. I am travelling along and without warning the brakes engage slightly - enough to shock - and the warning light comes on and stays on until I depress both front and back. I can then travel for a few seconds, minutes or for the rest of the journey without issue. I can also continue to travel at speed with the light on but feeling like something is not right. I've read threads about the light coming on being solved by changing the rear bulb and I've just done that but the fact that the brakes themselves activate worries me more - any clues?