knocking noise when applying the brakes from the rear

hot spots on rotors. take it to a shop and confirm. Roy

This car has disks on the back or drums, I believe is drums so probably your back brakes are worn out and out of balance need to be replaced. Or it could be that after putting back the drum parts to replace the brake shoes somebody didn't do the right job. This could cost you more $$$ if they put it the wrong way. Check to see if there is any loose parts and replace them.