97 Audi A4 Quattro Tranny Questions

Ok i am thinking on buying an A4 they want 2200. its got 135000 leather, moon roof,16'bbs wheels, most options, it has the 1.8 turbo automatic. My question is the guy said it needs some tranny fluid but you have to put it in underneath the car. so its low on tranny fluid but from the test drive it shifted fine and didnt sound bad that i can tell. Could there be problems that i should look for? Also when driving it makes a rubbing sound from the right front, i figuerd a warped brake rotor, does that sound right? any help would be greatly appreated, thanks.

I don't think it is a serious problem but get it checked by some professional.