Upgrading Ford Explorer brake rotors and calipers?

I have an 2002 ford Explorer with 20" rims on it. The brakes on the explorer haven't been effected too bad but i would like them to be better. I was wondering if taking the rotors and calipers from an expedition and putting them on my explorer would improve the braking on my car. If not, what could i buy to help improve the braking on my car?