Any recommendation as to minimum pad thickness before replacing front brake pads. new pads MB TEXTAR are 14 mm thick. Haynes says wear warning light will come on at 3.5 mm. minimum thickness recommended 2mm. I have heard that allowing pads to wear right down to minimum 2mm will cause caliper pistons to skew slightly in their bores leading to premature wear. any comments welcome about this and to the minimum thickness before changing pads. thanks