I have seen it from bad calipers.
They can be chipped have a chunk taken out.
The calipers are actually pretty soft material.
When did you change the pads they look like they are bad. Maybe got some rocks in there and they groved the pad.
Your best bet it go to les scwab get a free estimate or take them off and see what the problem is.
But you need too do a full brake Job now just replacing that side will be pointless, you can get all brakes and pads for around 230 for drilled and slotted.
Last edited by bwallace530; 07-22-2012 at 02:50 PM.