Brake Question

[Soup Nazi]

Today i went to replace my front brake pads. I went an got some OE spec replacements for the local Auto parts store. When i get to put the pads on, i notice that they are to small. I go back to the auto store, and tell them that they must have given me the wrong pads. They checked the numbers and all, and said no there the right ones.

I have the guy check the ABS pads, and what do you know, they are the right size ones that i need. My car is a non ABS car. Is it possible that someone before me put on ABS Calipers? This seems kinda odd that i had to use ABS pads on my Non ABS Car. Im just wondering about this and had to ask.

Besides the ABS system it's Self, whats the main Difference between ABS and Non ABS? Bigger pads/Rotors?


TIA