On bad roads, when I press the brakes even lightly my car tends to whip the back end around to the front. What could cau

I doubt a car will do a complete spin with a light tap of the brakes unless your going way too fast and have no rear brakes left and probably on wet pavement. I think you are driving too fast and then slamming on the brakes. This causes uneven brake wear and heats up front rotors. Have someone look at it and slow down before you kill someone going the other way or yourself.