Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Will this kit work on any bike? I have a Trek 820 and i really want to upgrade to disc.
Document: I bought Avid BB7 disc brakes to replace the cheap "Promax" disc brakes that came with my bike. Wow, what an upgrade! These are easy to install, easy to adjust, and work great! They have enough power to lock up on pavement, but are responsive and forgiving. One of the best upgrades I have made.
They don't come in a box or with instructions, but they still are nicely packed in bubbly wrap and bags. The set was made in January of 2014 so these aren't some kits that have sat on the shelf for 5 years or anything. My kit was missing one of the small rubber dust boots that go over the brake cable, but I don't really care because of the great deal I got. I might in the future buy a rebuild kit for these brakes or something that has the dust boot I'm missing. Now as for the riding performance review, all I can say is that these really did live up to the hype I read online about them.
The low end mechanical disc brakes that came on my new MTB bike were just awful. Once it became clear to me that no magic adjustment was going to improve the bad situation any further, I went looking for some replacement brakes. Some internet research lead me to the Avid BB7 brakes and this 160mm MTB BB7 brake package on Amazon.They were a bolt on replacement that fit perfectly and were simple to install and adjust.There were no instructions with them, but the internet told me more than I will ever need to know about them.Every problem I had with the original brakes are now gone with these new BB7 brakes and G2 rotors.
I bought these to replace a set of Promax mechanical disk brakes that came on my somewhat low end bike. These work much better than the original mechanical disk brakes. The adjustment is much better and the action is smooth and practical. The one bike I have ridden that had hydraulic disk brakes was actually too easy to lock up the front wheel for me. I prefer this set.
These brakes work well on my Bacchetta recumbent, but I think they would also be an excellent choice for a mountain bike. They replaced Avid BB5's which were very inadequate. The BB7's installation was straightforward, although dialing in the sweet spot took some trial and error. Getting two brakes and rotors for less than $100 was a very good deal particularly because they work so well. The product was delivered on time and included all parts promised. I would not hesitate to order from this vendor again.
You need to find the online videos and be experienced at bike repair to install these correctly. They came with no instructions and a mixed bag of bolts and parts that are not easy to figure out at first glance. You will also need to pay close attention to the internet instructions for adjusting and setting up the pad distances.Once installed and adjusted correctly they work great. I replaced the caliper brakes on my frame near the bottom bracket that kept getting dirty and corroded requiring constant maintenance.
I bought these because I had a slightly bent rear rotor and I didn't like the adjustment style for the BB5 MTB brakes my bike came with and I kept reading how much people liked the BB7 MTB brakes compared to BB5 MTB. First thing I want to mention in my review is the delivery date. It had an estimated date of about 3 weeks out which was no big deal waiting that long because the brake set was about 50% off normal price when I bought it. But it came in only 4 days! I was very surprised to get it so quick.
These were an upgrade from a shimano disc set on my MTB. The shimano's were flimsy and had a difficult time taming my 230 pound geared-up weight, even on the slightest hills. These are like day to shimano's night. Thick rotors, strong calipers. They do squeal a bit when cold or especially when wet, but good brakes need to heat up a bit anyway. Even in cold and wet they still stop quite well. One of my very favorite upgrades so far (the fork is still number one though).
My cycling experience was marred by brakes that were giving me problems with lack of stopping power and difficult to adjust.I ordered the AVID BB7 set after some research on the web and found a great price on Amazon.I went for replacing both the front and back brakes to get a consistent result.The brakes and discs arrived in good time and I fitted them the next day.The AVID BB7 is smooth and sure in stopping power a true upgrade for a great price.Thanks Amazon.
Bought these based on reputation and ratings. I was not let down. Upgraded from stock tektros on my trek marlin. Factory brakes barely stopped at all. These were fairly easy to install, I used the youtube video from avid. Adjusting these was very easy. I would recommend these to anyone. Only complaint is that they came from china in a cardboard box with no instructions...its up to you to find everything on the internet...product still deserves five stars.
Answer: yes