A visual inspection can assist detect cases of failing cables prior to it being an issue. However, the Garage door cables serve several purposes. The primary purpose of this cable is to lift, and is attached to the bottom of the garage door directly to the counter balance spring as is required by each type of counterbalance for each garage door. These cables might also be used as retaining cables, and is meant to assist in preventing your extension springs from falling or worst shooting across your garage if it breaks. Needless to say, your system cannot operate properly without them, and replacing such cables requires specific hardware and tools.