There's really no telling.
First off Audi doesn't make bicycles, they're just buying rebranded/repainted stuff from any of the already existing big manufacturers.
This is good, as it means you don't need "Audi" bike parts to fix it up, you can get the stuff from any bike store.
The next thing is that brakes and wheels come in a HUGE price range. A pair of wheels can be anything between USD 150-200 to USD 4000. Brakes can be anything from USD 50 to USD 1500. Adn they's still fit on the bike.
You need to determine, first what can go on the bike, then what you're willing to spend.
yes.
Not unless it has disc brakes--a 29" wheel has a radius 1.5" larger than a 26" wheel, so cantilever brakes won't reach the rims. The question I have is, why would you want to do this?
friction by applying the brakes? When you apply the brakes, there are pads on either side of the metal part of the wheel, they squeeze together tighter and tighter until the wheel stops turning, which stops the motion of the bike.
You increase the friction.
No brakes on anything work because of gravity. Pressure and friction are what stop anything utilizing brakes. On a bike, you pull the brake lever on the handle bar and it pulls the line connected to your brakes. The two brakes pads on either side of your wheel compress, applying friction and thus stopping your bike. The harder you pull, the faster you stop.
Depends on the type of brakes, but most bike brakes would use levers.
depends on the bike and the brakes. Go to www.parktool.com or www.sheldonbrown.com for more.
The with of a bike tire wheel in mm would be 622-20. This is math.
All bikes have 2 brake pads, one one each side of the rim. There is no need for two different brakes on one wheel. I guess it could work, though. You would need to drill a new hole in the frame for the second brake but if you want to try it, go for it!
Disc brakes and drum brakes.
Depends on what kind of brakes you have, but about 1-2 lbs less.
if your bike is a u, v or disk brake the cable is probably to tight or if you have hydraulic brakes of any kind your brakes will do this you just have to deal with it