new rear brakes

I have a 1995 cavalier sedan 2.2L no power options. My ABS system hasn't worked in over 2 years and I have had no problems with the brakes since I bought the car. I recently put new shoes on the rear tires and every once in a while I will hear a loud "boom" noise coming from the left rear brake when I am stopping. I was told that I needed new drums before I put the brakes on, could that be the problem or should I be looking for something else. I was also told to get a new wheel cylinder. Any ideas at all would help.

Thanks,

Mike