I also have a question. My offside rear wheel is slightly stiff to turn and I suspect it is because of a partially seized caliper. I plan to strip it down and have a look, however in my haynes manual (which is really needed Bryso21) it says that the 'guide pins' must be replaced. How necessary is this? They look like just a bolt. I hardly want to go to an Audi dealer to arrange a special order. Thanks
Grape.

 

They don't need to be replaced unless they need to be replaced. Meaning if they're in good condition then reuse them after lubing them up with brake lube (or plain high temperature grease).

 

Thanks appreciate that confirmation

 

Was doing my rear brakes this week and had the exact same problem,

1. Stuck Caliper pin
2. Inner pads were worn to the metal, outer was okay worn just half the way.

I just replaced the pins and the boot with these parts from ECSTuning and Autozone -

Home Page > Search > ES565 > ES#565 Caliper Pin Boot Repair Kit - Priced Each - 443698470
Duralast/Brake Caliper Bolt/Guide Pin (H15913) | AutoZone.com