Ive bled and fully rebuilt my avid cr's a few times now and weird as it sounds i actually got into pissing around with them even find it quite fun. They are deffinatly more of a faf than other brakes but when you find that sweet spot they cant be faulted. I started with this
http://cdn.sram.com/cdn/farfuture/5WCqT ... _final.pdfthe official avid manual and this is also a good video..
http://www.pinkbike.com/news/tech-tuesd ... -2010.htmlThe bleed kits of ebay all work fine, but look for one with a wide brass screw nipple (the bit that goes in to the caliper body) as this will help you get a tight seal.
Sorry to ramble on but itll make your life a lot easier. The first time i bled them i did it three time to get all the air out of the shitty factory bleed but one thats done it takes about 10 minutes once every 6 months.
At the other end take out the pads from the capiler body and spray with gt85 pump the brake and then gently push back in to the body. If you go this a few times it helps to push some the brake dust away from the seals and loosen the pistons. youd be amazed how somthing so simple can make so much diffrence easpecially to that spongy feel.
there yo go lecture over and good luck haha