Chevrolet Repair: 98 Chevy Blazer, chevy blazer, disk brakes

Question
I recently replaced my back disk brakes and rotors, as well as rotating my tires. since rotating my tires I have driven my Blazer about 80 miles with no ploblem. Today I was going to drive my truck but when i started going forward and hit about 15 MPH, my left front tire started making noise and vibrating as if i was going down a dirt road. I checked the lug nuts and they are all tight. My 4X4 has recently stopped working, so I know that it is not stuck in 4X4.  Could the tires be out of balance for their new locations on the vehicle? Do you have any suggestions that I can check on my own? I really hope this does not sound like anything major, that is the last thing I need!

Answer
unfortunaly, tire balanceing can be done at home but its easier to get a locl shop to check. i would start there, next i would check the brakes you installed, make sure you installed them proper. and did you bleed them? and make sure you installed the pads themselves on right. check all this and im sure youll find out what went wrong. keep me posted.