Something not right - puff of smoke (OSF)

[johnny_quattro]

I've just seen a puff of smoke emanating from the driver's side front wheel (OSF) whilst waiting in traffic. My brakes aren't red-hot (checked and showing 45C on IR thermometer) and I was wondering if this is due to some seal that goes, inevitably leaking onto one of the front cats? My old A8 used to do this on a regular basis, but I've not experienced it so far in my A8L.

I always thought that it dripped on the nearside cat i.e. passenger-side but this puff of smoke came out of the driver's side wheel area. I'm sure some learned person will be along in a minute to allay my concerns... or tell me it's going to cost more money lol

Cheers all.