Rear Ended - car repair question

Rear ended one day ago, now my abs brake light and traction light are on, my front breaks were replaced 18 months ago, rear breaks one week ago, could something during the rear ended accident have caused an issue with my breaks?

How bad was the accident?? Was the back of your Olds crushed? If so, the answer is yes.

rear end not crushed, jerked ahead is more like it, damage to rear is cosmetic, scratches, indentation the license plate that hit me from the rear is visible