Garage Door Cable Snapped? Here's What Happens Next

Garage door lift cables are the steel cables that run from the bottom corners of the door up to the drums on the torsion bar. They work in tandem with the springs to lift and lower the door safely. When one snaps, the door becomes extremely dangerous.

What Causes Garage Door Cables to Break?

• Normal wear and tear: Cables typically last 8–15 years with regular use
• Rust and corrosion: Moisture causes steel cables to corrode and weaken over time
• Fraying: Repeated bending over the drum creates micro-fractures in the cable strands
• Improper spring tension: If springs are over-tensioned, cables bear extra stress
• Bottom bracket failure: If the bracket the cable attaches to fails, the cable can snap

Warning Signs Before a Cable Snaps

1. 1Visible fraying or rust on the cable strands
2. 2The door feels heavier than usual on one side
3. 3The door moves unevenly or tilts when opening
4. 4You hear a scraping or grinding sound from the cable drum
5. 5The cable appears loose or has slack when the door is closed

What Happens When a Cable Snaps

When a cable snaps, the door loses support on that side. The door will tilt, jam in the tracks, or in the worst case, fall completely. If the door is open when the cable snaps, it can crash down with its full weight — 150 to 400 pounds — with no warning.

Why You Should Never DIY Cable Replacement

Garage door cables are under extreme tension from the springs. Replacing them requires releasing spring tension first — a dangerous procedure that requires specialized tools and training. Attempting this without proper equipment can result in the spring releasing violently, causing severe injury.

What to Do If Your Cable Snaps

1. 1Stop using the door immediately — do not attempt to open or close it
2. 2If the door is open, do not try to close it manually
3. 3Keep children and pets away from the garage
4. 4Call a professional technician for same-day emergency service
5. 5Do not attempt to drive under a door with a broken cable

How Much Does Cable Replacement Cost?

Professional cable replacement typically costs $90–$200 for a single cable and $150–$250 for both cables. Most technicians recommend replacing both cables simultaneously since they wear at the same rate. The service call usually takes 45–60 minutes.