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Create a channel Learn moreIf everything else works for you on the bike then you can upgrade the brakes. Look at Avid BB7s or BB5s, they are very good and not too expensive especially if you find a used set.
You should be able to install the brakes yourself, just take the time to read the manual.
Re: the chain skipping and jumping teeth. It may be that it's not set up correctly and/or the parts are not very good. To check the see if they are set up you will need to do the following:
Front Derailleur - better directions here Park Tool Co. » ParkTool Blog » Front Derailleur Adjustments
1. Check the derailleur height
2. Check the derailleur rotation
3. High and Low limit screws (these are like the screws on a carburetor)
4. Cable tension
Rear Derailleur - better directions here Park Tool Co. » ParkTool Blog » Rear Derailler Adjustments (derailleur)
1. High and Low limit screws
2. B tension screw
3. Cable tension.
All good advice. It would make a lot more sence to return the bike and find a less expensive but higher quality bike that would be worth spending money on from time to time for upgrades. If you want to see some price points of decent bikes look on Mountain bike news, photos, videos and events - Pinkbike or Mountain Bike Review ? Best, Bicycle, MTB, Bike Parts, For Sale classified adds. It will give you some ideas. They also have some good forums to get some very good information. There are several poss causes for the chain to skip as posted above also the cain is prob lower quality and may be bent or rusted and binding. Roll the chain backwards slow and look for a link or two to bind up.
In all reality it should be an easy and inexpensive fix for the chain skipping. Dont forget about chainline and over extending it. As a rule you will want to run the top half of the cassette in the small ring, and the lower half in the large ring, and you can run the whole thing in the middle ring.