A4 Brake Help pls.

S4 Brake Help pls. I'm new here... I am an active member of the Pelican Parts forums but I need some help with my Audi. Thanks for any help you can offer.

I have an 01 S4 Avanti (B5) with 138k. This morning I started to replace my rear pads and rotors. Before I got very far, I realized I did not have all the parts needed... I didn't purchase new caliper mounting bolts as recommended in my "Haynes VW Passet & Audi A4" manual.

My questions:
- Is there a better manual available for S4's (B5)? I have a Bently manual for my old 911 but I haven't found one specific to the B5 S4.
- What it the service (thickness) on the front and rear rotors? It isn't listed in the Haynes Manual.
- While inspecting the rear brakes, I noticed that one of my Lucas calipers is missing the rubber dust shield and the other is torn. To replace these, do I need to rebuild the entire caliper?
- Do the rear pads need shims or is a spray-on "disk quiet" product OK?
- What is the best parts source for Audi's (price and quality of selection)? I purchased new pads and rotors from Pelican Parts but I didn't do much research on this.

I love my Audi...it rocks my 105 mile daily commute into NYC. I am looking forward to becoming an active member of your community. Thanks again for any help and advice you can offer.