I have a 2001 GMC Sierra 4.3L 2WD.  I recently replaced the rear brake pads because I could hear a squealing noise when the truck was moving at low speeds and when I put on the brakes it went away.  The pads were worn with a little left on them and the rotors, surprisingly, looked good.  Once I got everything put back together I took it for a road test.  I can hear a noise still coming from the driverside rear but it is no longer a squealing noise and it does not go away when I brake.  Also, once I get up above 50 I start feeling a vibration and it was not there until I replaced the pads.  Any ideas and suggestions?  Thanks for any help.
				
			 
	