E break light flashes an alarm sounds was on constantly.

Hello, Changing the brakes will likely not help. The vehicle needs to see a professional, or you will have to find a good tutorial that shows the the exact locations, and what you need to do at those locations to get a trouble code. If there is already a noticeable pattern in the blinking, i.e. it blinks several times, pauses longer than normal, then repeats, this is a code. The problem can be several things, but certainly will be related to the rear anti-lock brakes. Certified shops in your area: http://repairpal.com/chevrolet-within-10-miles-of-amherst-ohio-44001