Everybody knows a garage door has springs. Very few people know it has cables, or that the cables are what actually carry the door’s weight once the springs have done their part.
You usually find out when the door sits crooked, one side higher than the other, or jams halfway and will not move either way. Sometimes there is a loose steel cable hanging beside the door.
What they do
On a torsion-spring door, a steel cable runs from a bracket at the bottom of each side up to a grooved drum on the bar above the opening. As the springs unwind, the drums wind the cables in and lift the door evenly on both sides.
Evenly is the operative word. The two cables are a pair. When one fails, that side drops and the door racks out of square immediately — which is why a snapped cable so often takes the door off its track in the same moment.
Why they fail faster in South Florida
A cable is a braided steel rope, and it fails from the inside.
Salt air. Close to the water, salt-laden air corrodes individual strands from within the braid. From the outside the cable can look fine right up to the day it parts. This is the main reason cable life here is shorter than a manufacturer would suggest.
Standing water at the bottom bracket. The cable anchors at the lowest point of the door, which is exactly where rain and humidity collect. The bracket and the first few inches of cable take the worst of it.
A door slightly out of square. The cable then does not seat cleanly in its groove and abrades against the drum edge on every single cycle.
Tired springs. As springs weaken, cables carry more load than they were designed to. One failing part quietly shortens the life of the next.
The warning signs
Twice a year, take a flashlight and look at both cables where they meet the drums at the top and where they anchor at the bottom.
- Fraying — individual broken strands sticking out of the braid. A cable with visible broken strands is close to failing.
- Rust, particularly in the bottom few inches.
- Kinks or flat spots, which mean the cable has been riding wrong.
- Slack on one side with the door closed, which means it has started coming off the drum.
Look only. Do not pull on them, do not try to re-seat one, and above all do not loosen the bottom bracket.
Why this is not a DIY repair
The bottom bracket the cable attaches to is under the full tension of the spring system. People loosen it believing they are freeing a cable, and the bracket becomes a projectile. It is the most common way homeowners are seriously hurt by a garage door.
Beyond the danger, a cable must be wound onto its drum with the correct number of turns and matched tension on both sides. Get it wrong and the door runs permanently out of square, which chews through rollers and track and eventually deforms panels.
What a proper repair looks like
Both cables get replaced, not only the broken one — same age, same air, and the second will follow the first within months. The door is secured and tension released safely first, then the drums are re-set, the cables wound to matched tension, and the door re-squared and balanced.
Near the coast, ask for galvanised or stainless cable rather than the standard option. The price difference is small; the life difference is not.
Common questions
Can I drive the car out if a cable snapped?
Not safely. The door is unbalanced and can come down hard and unevenly. Leave it and call — forcing it is how a cable job becomes a panel and track job.
Do both cables need replacing?
Almost always. They are the same age and have corroded at the same rate, so replacing one leaves you waiting for the other.
How long should cables last here?
Less than inland. Salt air corrodes the strands from inside the braid, so coastal properties often need them well before a published lifespan suggests. Galvanised cable lasts considerably longer.
My door is crooked but the cables look intact.
A cable can come off its drum without snapping and produce exactly the same crooked door. Either way, stop using it until it is re-seated properly.
How fast can you get out?
Most cable repairs across Miami-Dade, Broward and Palm Beach are same-day or next-day. Tell us if the door is stuck open.
Need someone to look at it?
SHL Garage Door covers Miami-Dade, Broward and Palm Beach County. Free estimates, the full price before we start, and most repairs handled same day or next day.
Call (305) 897-7662 or send us the details.
Services: Garage door repair · Spring repair · Opener repair · Off-track doors · New installation · Gate repair · Commercial
Areas: Hialeah · Coral Gables · Doral · Kendall · Aventura · Fort Lauderdale · Boca Raton · West Palm Beach