does the wheel rotate by hand when you jack the car up? can you feel it binding? Did the caliper come off the disk easily?
Good luck.
Dan
P.S. Dont forget to check your brake fluid level and pump your brakes before setting off....did exactly same as you once and forgot to pump the pads together in the calipe i'd took off.....thankfully the handbrake and dropping down into 1st gear slowed me enough not to have a bump....rookie mistake ot make looking back now.