I would agree - sticking caliper piston. I've had one do the same and only 1 of the four on the same wheel sticking has caused the disk to warp slightly when it's heated up too much and you can feel uneven travel when braking.
When we looked at it on Saturday it was caused by water/crud getting past a piston seal that wasn't on properly and causing the piston to stick.
It's not a very old caliper and we were able to free it off so I've ordered some new discs and pads today which will be fitted on Thursday. We will clean up the caliper and see how it goes.
Got a great price on Pagid OEM discs and pads from ECP as they've got a 30% off sale on over the bank holiday weekend (code holiday30) and the whole lot for the front (2 discs and all front pads) was £108 incl vat and carriage, so not too bad. 
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Confidence is the feeling you have before you know better . . . . 
Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble 
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
Last edited by Architex_mA8tey; 7th May 2012 at 03:47 PM.
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