IF YOU HAVE TO ASK THAT QUESTION, YOU SHOULD NOT BE DOING THE JOB IN THE FIRST PLACE.
NOT TO BE RUDE, BUT.......REGULAR PEOPLE THAT DON'T HAVE THE TRAINING, OR THE SPECIAL TOOLS TO REPAIR BRAKES SHOULD NOT BE ATTEMPTING TO DO SO, NOT ONLY IS YOUR LIFE IN DANGER, BUT SOMEONE ELSE'S MAY BE ALSO.
PLEASE THINK ABOUT THAT BEFORE ATTEMPTING ANY REPAIRS YOURSELF.