I have shimano deore disk brakes and the rear one seems to be rubbing could it be warped? If so what can i do about it?

if the pivot to sprocket of the de-railer is the same length there will be no problem

Which, front or rear?

All the Shimano groupos are here...

http://techdocs.shimano.com/techdocs/blevel.jsp?FOLDER%3C%3Efolder_id=2534374302051135&ASSORTMENT%3C%3East_id=1408474395181679&bmUID=iLiFAGG

This is an advice site.

Buy a new one. Or fish around here for documentation:
http://techdocs.shimano.com/techdocs/blevel.jsp;jsessionid=nvLpMgwbygJL25hRQpvjzxw8hPj2WxcX6TJRn2nYc3dRdhyfXrZh!-1300185610?ASSORTMENT%3C%3East_id=1408474395181679&FOLDER%3C%3Efolder_id=2534374302051937&bmUID=iF4uLYA

Then figure out the root cause of the failure to shift.

http://parktool.com/repair/readhowto.asp?id=117

Good luck.

Sounds like the shifter is toast. One of these may help you figure it out:

http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Deore-XT/FrontDriveSystem/SI_6K9FG_En_v1_m56577569830604945.pdf

http://techdocs.shimano.com/techdocs/blevel.jsp?ASSORTMENT%3C%3East_id=1408474395181679&FOLDER%3C%3Efolder_id=2534374302051937&bmUID=1210371429135

Derailleur info and instructions:
http://www.parktool.com/repair/readhowto.asp?id=64

Shimano make an "EZ fire" which is an integrated shifter/brake lever combination and cheaper than buying seperate shifters and levers.


e.g.
http://www.tredz.co.uk/.Shimano-Acera-8-Speed-EZ-Fire-ShiftersBrake-Lever_24339.htm

There is a washer on the hub that is not supposed to spin, so it has a "key" in it that matches the machined area of the axle.

Hope this answers your question,
matt

HERE is Shimano's exploded-view diagram of the shifters, but it really only gives you a ballpark idea of the assembly. You will have to piece the rest together from memory, i suppose. Sorry, i could not find more information for you.

Hope this helps a little,
matt

Try this first:
Shift into the small ring and release the cable. Pull it tight (with pliers) and re-tighten the cable. It should shift now. If it doesn't, the solution is a little time consuming, so i apologize in advance.
First, flip your bike onto the bars and saddle. Now shift into the small chainring and your lowest cassette cog (the largest in number of teeth). Release the cable from the front derailleur and set the adjustment knob for the front derailleur to its center point. You should find it on your shifter. Now adjust the "L" setting on the derailleur while turning the crank so that its stop sets it in a position where it just skims the chain but does not touch it. Now pull the cable taut and re-clamp the cable. Shift into the middle ring and shift the rear derailleur to its highest and lowest gears, making sure the chain does not rub the front derailleur. If it does rub (it will be in either the lowest or highest cog on the cassette), adjust the front derailleur by way of the adjustment knob to clear the rub. Then shift into the big ring and you should have no problem. Set the "H" stop if necessary.

have new fluid handy...I think it uses mineral oil.  Open the bleed screw squeeze hand brake until all bubbles come out. retighten the bleed screw before you release the hand brake.  Repeat as needed.  Keep the reservoir full.