I recently bought a new commuting bike (Norco ccx3) which has mechanical disc brakes (Promax DSK-715 Road Mechanical Disc). Thus far I've been pretty happy with them.
In the last couple of commutes, I've noticed an ocasionally 'ting' sound coming from somewhere on the bike when I would hit a bump. This morning I figured out what it was.
On the front brake, the pads are a a bit loose in the calipers. That is, the spring clip thing is still in there, but when there is no pressure on the brake cable, the pads can rattle a bit between the caliper and the rotor. With the wheel in, there doesn't appear to be enough room for the pads to slip out and there still is a fair bit of pad left.
Is this normal, or is there any danger to this?