I went out wheelin in the mud the other day and now it feels like my brakes dont have the stopping power they used too. I checked the fluid level and it was a little low so I put so more in but it didn't help. I dont think there is a leak, it feels like I cant push the pedal all the way down. Could I have clogged a brake line? It is a '90 Sidekick w/ 32x10.50s. I also checked the lines none of them seem to be kinked, so I dont know Thanks for your help.

Perhaps mud or other debris in the calipers?  Explains why the pedal doesn't go down as far  :-/

I got mud into the rear drums, made for hard brakeing
Problem is it's a pain to get the drums off, but your front
pads will wear fast if the front has to do all the stopping.

ya i have to replace all the brakes once or twice a year.   mud kills the pads bad.  lata stu

I talked to a buddy of mine he said it might be air in the lines. Or could I have gotten junk in with the fluid and clogged something? I just dont want to start tearing things apart before I know what it might be. Thanks for the info I just thought of this, I had it flexed pretty good could I have messed up the overload/brake thing near the rear axel link? Do i even need it, what does it do? Oh and could I have blown a fuse or shorted somthing out with any of the elctronics with the brakes I noticed some wire connecting to it.

drop the rear wheels off and clean out the drums. they will be full of a mud/brake dust paste. if not removed it will finish a set of rear brake shoes in a hundred miles or so. :-/
i usually end up changing the rear shoes about 4 or 5 times a year as we generally do more mud pluggin than dry rock terrain. i only change the front pads about once a year
roll on a rear disc conversion  

tonka-toy

Thats why I went to rear discs, ten sets of rear shoes in 18 months. My car is a daily driver so I don't always have time to clean the rears out immediately after each session, either that or they're shot by the time I've driven home. Wet sand is the worse you can kill a new pair of shoes in just a few hours.

Thanks for the help guys i ended up puttig new shoes in, and I am gonna bleed the brakes next week. The new shoes solved it, but i htink it could use new fluid any way.

Yep changing your brake fluid every year or so is a good practice anyway since no matter what you do it will absorb water and lower the boiling point.  

If you hate bleeding brakes as much as I do, look into the little valve style things earls makes or russel speed bleeders.  They both have some that will fit.  Think they're only around 10 or 15 bucks per axle so it's pretty reasonable.  Great invention even if it's basically just a check valve.