Oh and check your tire pressure. If it is too soft the tire could be mushing down when the weight is shifted forward onto it and it causes it to vibrate. Seeing as how it is a new bike I am guessing it is not your pads or rotters. Rubber break lines swell up during hard breaking and can pulse your breaks. Braided lines don't, so a lot of stunt riders well change to braided lines because they are more demanding. Rubber lines are more forgiving when it comes to hard breaking where as a braided line stops when you tell it to stop. Sorry for rambling on but the concept is hard to explain via written communication lol.