I had a K4 1000 and several others I know also had the same problem. apparently its caused by the pad rocking on the middle piston although when I changed to braided hoses and sintered pads it disappeared. I doubt any shop will agree that a fault is present.
What is SuperBike?
SuperBike is an irreverent, humorous and massively informative magazine for all kinds of bikers. The staff has decades of testing and riding experience and are all still passionate about bikes. Biking is – or should be – great fun as well as a huge thrill.