96 cavalier brakes - HELP

How do you remove the brake piston from a left rear brake drums?

HELLO NANK,not sure what you want to do???if brakes are drum brakes what piston are you talking about!!more info please as to what you are trying to do.....

just guessing that you want to remove the brake/wheel cylinder? . remove the brake shoes. remove brake line from cylinder .Two bolts go thru the backing plate into cylinder remove those, likely to twist off .then pry the cylinder out. Hopefully backing plate is still in good shape. And Welcome to AF