Once the spring is free of tension remove from its track hanger.
Old style garage door side springs.
Many conventional doors with hinges at each side use one piece springs at each hinge.
If it was opening too quickly move it to the next lower hole.
If you have one spring on each side of your door one of your springs breaks the spring on the other side will probably break soon.
Retest the door balance as you did in step 1.
As a result you may run into balance issues if you only replace one spring.
Roll up doors with tracks and.
If you only replace the broken spring your old spring will be weaker as it will have lost some of its pull.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
Garage door springs come in three basic types and each is measured differently.