I have a 2005 Specialized HardRock Sport with disc brakes.
When I'm slowing down from a reasonable speed with the front brake, I noticed that the top of the front wheel appears to deflect sideways toward the disc. I can't tell when I'm riding but I suspect that the whole wheel is twisting. This doesn't seem to be safe to me, and I'm don't remember that happening before when I ride.
I tightened the QR on the front already. What else could be the cause of this or where should I start to look? Or has it always done this and I never noticed before?