So today I rode my cross check for the first time since last weekend, and I noticed that when I used the front brakes the whole fork and wheel seemed to vibrate and shudder. It was visible, not just the feeling of it. It also sounded like the pads weren't making constant contact with the rim. My first thought was the wheel was out of true, but I got off and tested it and it rotated near perfect. Also I don't see how it could have been since the bike gave no indication of any issues last time I rode it. Only thing that has changed was I washed the bike. Rear wheel seemed fine though.

Any thoughts?