Go to your local library and check out the mechanics book that goes for that year of auto.
It has both Rotors and Pads. In other words disc brakes
If you only did the front brakes, the problem may be in the rear brakes.
Were the rotors resurfaced or replaced, or just the pads? Warped rotors are the most common cause of vibration when braking
I believe you need to turn a rotor or both rotors. They probably were not turned on your brake job It is cheaper to just replace the rotor than to have it turned, I have found this is a typical problem on the Catera
roters need to be turned Most likely the rotors are warped from hard use- need replaced.
Your rotors had the grooves before, from the old pads. You should have had them turned. Next time check rotors at time of fitting new pads. If you can see or feel grooves then they should be repaired.
Front rotors are warped and need to be replaced. Could be an out of round disc brake rotor
A frozen brake caliper or if you just instaled new brakes and rotors you might have oil on the rotors as they need to be clean before installing.
Have the front rotors turned on a lathe at a dealership. check brakes and rotors
Yes. Rotors on front brakes, drums on rear.
( 2 rotors on the front ) one for each DISC brake
There can be. Only way to know is have your brakes and rotors inspected.