Hi Raj, I went for refurbed ones, I couldn't wait I was in a hurry to pass the MOT.
arrived very quickly, seem to be working fine, when I sent my old ones back the refund came very quickly. Not bad for £95. Although you do have to pay for postage back for the old ones.
http://brakeparts.co.uk/#!/shop/AUDI...inders/BCA3812
You could try this first, get yourself some ACF-50 spray, if the handbrake lever on the caliper is stiff but still moves a bit. Keep spraying it in there, moving the lever back and forth, to get it moving again.
http://forum.a8parts.co.uk/showpost....0&postcount=12