2001 chevy 3500 dually - I need to adjust the e brake.

Should be inboard of the frame, roughly under the pedals.

you have to get under truck look for access hole at backing plate you need brake adjusting tool to turn adjusting star wheel until drum brakes away from brake drum so you can remove the brake drum.you need tools to remove rear wheel from drums you need a large breaker bar and large hammer and a large socket remove spindle nut.

If you have drums on the rer yes you do have to remove the axle its simple though you unbolt the 6-8 bolts on the end of the axle then it just simply slides out thats it there mite be some resistance but there isnt anything else holding it in. and you dont have to worry about putting it back into the same spot eather just slide it back in and line up the drum.

Check the headlight switch. The power goes from the fuse to the headlight switch and then to the dash and running lights.

check and make sure the powrr wite has a solid cconnection the check the grounds to the starter.

This sounds like the hydroboost unit is leaking.behind the master cylinderThe braking system on this using the power steering pump to provide power assisted brakes instead of a brake booster. The hydroboost unit most likely needs replaced.

Check out rockauto.com

1. pull axles apx 6-10 bolts.
2. remove large holding nut
3. remove keeper\
4. remove 2nd nut
5. should now be able to pull off brake drum

Try this website :-http://www.compnine.com/index I used it to fit a parking brake to our 1999 sierra that had them missing

You should be able to just slack the brakes off and pull the drum. They aren't heavy.