Last night I had someone make a U-turn in front of me on a 3 lane highway with a speed limit of 55 mph. Going about 60 when this bozo decides to go. Had to jump on the binders hard as I was at the front of a pack of traffic that had left a light about a 1/4 mile back. Both brakes at almost lock up, front end shook violently,not side to side but more front to back.Brakes are in good order,fresh pads all around about 500 miles ago,and there was no pulsing in the lever leading me to not think its a warped rotor. The bike has 12,000 miles on it and is primarily a commuter(daily driver,no car)and weekend play toy. I've done plenty of track days in the past with other bikes and can say the Z has had an easy life compared to my other bikes which I never had rotor issues despite heavy brake use. Has anyone here had any rotor problems with similar milage or have any suggestions as to maybe another cause for this shake. Also as a side note I dont do intentional wheelies(sometimes they just happen ) and the bike has never hit a pothole or been down. Hate to think I have to get rotors at 12k miles since my last bike,02 Gixxer 1000,had 58,000 miles and I only did pads and had none of this. If anyone has any suggestions please let me know what you think.