Quick answer: A garage door cable about to fail usually gives you warning signs: broken strands sticking out like bristles, a slack loop of cable, or a door that rises crooked. A loud bang can mean a cable or spring just broke. If you see any of these, stop using the door, keep people clear and call us. Cables are under spring tension, so this is never a DIY fix.
Key takeaways
- Frayed strands, a slack cable, a cable off its drum, a crooked door or a loud bang all mean stop using the door and call.
- Cables and bottom brackets are under spring tension. Do not touch them, and do not pull the emergency release with the door up.
- Rust often hides in the turns of cable that stay wrapped on the drum, so a cable can look fine and still be weak.
- Our long wet season is hard on original cables, especially in Portland and Vancouver homes built in the 1970s through 1990s.
What does a garage door cable about to fail look like?
Your door has two lift cables, one per side. On most homes, each runs from a bracket at the bottom corner of the door up to a drum above the opening. Doors with extension springs route them through pulleys instead.
To check them, close the door, grab a flashlight and look along each cable from bottom to top. Keep your hands off. Here is what we at Larry Myers Garage Doors look for, and what each sign means.
| Warning sign | What you see | What it usually means | What to do now |
|---|---|---|---|
| Fraying | Broken wires poking out like bristles, a fuzzy or thin spot | The cable is wearing through | Stop using the door and call |
| Rust | Orange or brown staining, a rough or stiff look | The steel is losing strength | Book an inspection soon |
| Slack cable | A loose loop, or a cable hanging away from the door | The cable has lost tension or slipped | Stop using the door and call |
| Cable off the drum | Cable sitting outside the grooves at the top corner | The cable has jumped the drum | Leave the door in place and call |
| Crooked door | One side higher, or the door rising at an angle | A cable on one side has slipped or broken | Stop the door and call |
| Loud bang | A sharp bang, then a heavy or hanging door | A cable or spring has snapped | Keep everyone clear and call |
Every row except rust means stop and call. Check the bottom corners too: the bracket where the cable ties in should not be rusted through, bent or pulling away from the door.
Why does a cable fray, rust or jump the drum?
Each time the door opens, the cables wrap onto the drums and help the springs carry the door’s weight. Three things wear them out:
- Years of use. All that bending tires the thin steel strands, and they can start to break one at a time.
- Rust. Damp air settles on the steel. Rust eats into the strands and can weaken a cable long before it looks bad.
- Slack. A cable jumps the drum when it goes loose, for example when the door closes on a trash can or when ice holds it down (see our guide to a garage door frozen to the ground). When tension comes back, the cable can land outside its groove.
Is it safe to use the door if a cable looks worn?
Not if the cable is frayed, slack, off the drum or letting the door hang crooked. The industry group DASMA points out in its garage door safety tips that the cables tie the spring system to the bottom brackets, and that bottom brackets should be adjusted or loosened only by a trained door systems technician. In plain terms, the parts at the bottom corner are under spring tension.
Here is the safe response:
- Stop using the door. Do not press the remote or wall button again.
- Keep people, pets and cars out from under it.
- If the door is up, leave it up. Do not pull the red emergency release cord. With a weak cable, the door may drop or twist once the opener lets go.
- Hands off. Do not touch the cable, drum or bottom bracket, and never put your fingers between door sections.
Light surface rust on a door that still runs straight is different: use the door gently and book an inspection. If your cables look clean, the monthly balance check in our guide to the garage door balance and reversal tests is safe to do. If you see fraying or slack, skip it.
What happens if a cable snaps while the door is open?
On most doors, the two cables share the load. When one breaks, that side can drop, twist in the tracks and jam at an angle, and the rollers can come out of the track. A breaking cable can also whip, which is one more reason to stay clear.
If it happens, leave the door where it is. Do not run the opener or pull the emergency release, do not drive under a crooked door, and keep children and pets out of the garage until we get there.
Doors with extension springs need one more safety part. DASMA’s garage door systems safety tips say each extension spring should have a safety cable running through it, secured to the wall or ceiling. That cable helps keep a broken spring from flying loose. If you do not see one on your door, mention it when you call.
Why cables rust faster in Portland and Vancouver garages
Our winters are more wet than cold, and that is hard on steel. NWS Portland says nearly 90 percent of the year’s rain falls between mid-October and mid-May. NOAA normals show about 18 to 19 days a month with measurable rain at the Portland airport from November through January, and Vancouver’s Pearson station is a touch wetter in December and January. A garage in Gresham or Hazel Dell rarely gets a chance to dry out.
Housing plays a part too. Many homes from Beaverton to Battle Ground went up in the 1970s through 1990s, and plenty still run their original cables. After decades in damp garage air, the rust often hides where you cannot see it: in the few turns of cable that always stay wrapped on the drum, and down at the bottom bracket, where a dripping car and a damp slab keep things wet.
Late summer is the easy time to deal with it. By NWS Portland’s count, only about 3 percent of the year’s rain falls in July and August. A cable that is already weak has the whole wet season ahead of it. Oregon homeowners can reach our Portland line at 503-852-9238, and Clark County homeowners our Vancouver line at 360-777-6854.
What a technician does on a cable call
A cable visit from one of our technicians usually goes like this:
- Secure the door so it cannot drop or shift while we work.
- Inspect both cables, drums and bottom brackets, plus the springs, rollers and tracks. A cable problem is often a sign of trouble somewhere else.
- Explain what we found, and what can wait, before any work starts, with transparent pricing and no hidden fees.
- Replace the worn parts with the spring tension safely under control. We usually suggest new cables on both sides, since they have aged together.
- Balance the door and test the safety reversal before we leave.
If the springs are rusted or worn out, we will tell you, since a new cable on a tired spring may not last. Our page on garage door spring repair explains that side of the job.
When to call a professional
Call right away if you see frayed strands, a slack cable, a cable off its drum, a crooked door, or a bottom bracket that is bent or rusted through, or if you hear a loud bang. Stop using the door until we have looked at it.
Book a visit soon if the cables show rust, the door shudders or jerks, or your home still has its original cables. DASMA also recommends a yearly visit from a trained technician to keep a door running safely.
Our garage door repair team handles cables, springs, rollers and hinges on both sides of the river, and same-day service is available. Call either number above, or reach us through our contact page.
Frequently asked questions
What does a frayed garage door cable look like?
A frayed cable has short, broken wires sticking out from the strand, like the bristles of a worn brush. You may also see a fuzzy patch, a thin spot or a kink. Fraying often shows first near the bottom bracket or at the top where the cable meets the drum. Any fraying means stop using the door and call.
Can a garage door cable be replaced without a professional?
We do not recommend it. Cables and bottom brackets are under spring tension, and DASMA says bottom brackets should be adjusted or loosened only by a trained door systems technician. LiftMaster’s maintenance guidance also says not to do your own work on springs, cables or other hardware under tension. One slip can drop the door or release that stored energy all at once. Call us instead.
How long do garage door cables typically last?
There is no set number. Cable life depends on how often the door runs, how well the springs are balanced and how damp the garage stays. In our wet climate, rust is often what ends a cable’s life, not use alone. If your home still has its original cables, have them checked at a yearly inspection, even if the door seems fine.
Why did one cable slip off the drum without breaking?
A cable comes off its drum when it goes slack. Common causes include the door closing on an object, ice holding the bottom edge down, a spring losing tension, or a worn roller or bent track letting the door bind. When the tension returns, the cable can miss its groove. The door usually hangs crooked afterward. Stop using it and call, since the springs still hold stored energy.
Worried about a frayed or slipping cable?
Larry Myers Garage Doors has treated Portland and Vancouver customers like neighbors since 1973: transparent, affordable pricing, same-day service available, no extra charge on Saturdays, work backed by our warranty, and estimates that are always free.
Licensed, bonded and insured: Oregon CCB #167435, Washington #MYERSGD942K4. Authorized dealer for Northwest Door, Clopay, Genie, LiftMaster, Wayne Dalton, Linear and Windsor. Serving Multnomah, Clackamas, Washington and Clark counties. Read our reviews.