Where This Job Goes Sideways
Most houses in Union City went up around 1979, which puts a lot of garages here right at the point where the original torsion spring, the original cable, and sometimes the original opener have never been swapped out. Nobody replaces a spring that hasn't broken yet, so a lot of this hardware is doing its forty-plus-year victory lap right now. That's not a knock on the builders, torsion springs from that era were built solid, it's just physics catching up. Springs are rated for a number of cycles, not a number of years, and a door that's opened twice a day for four decades has used up its cycles whether it looks worn or not.
When it fails, it usually fails all at once: a loud bang, the door drops fast on one side, or it simply won't move off the floor. That's a spring or a cable, and on a door this old, it's rarely just one part, the drum, the bearing plate, and the track brackets have all been carrying the same load since 1979 and none of them are getting younger. We drive the 9 miles from Pleasanton for these calls because a door that drops wrong can take a hand or a bumper with it, and that's not something to leave sitting.
What the Fix Involves
On a house from this era, the fix starts with figuring out what's actually original versus what a previous owner already touched. If the spring, drum, and cable are all original 1979-vintage parts, we're not just swapping one piece, we're checking whether the whole assembly is still square, because rust and fatigue rarely hit just one component.
A broken torsion spring gets replaced in a matched pair, even if only one side let go, because the other one is on the same clock and running it alone just moves the failure a few months down the road. Cables get checked for fraying at the drum end, where decades of the same wrap pattern wear a groove. If the track brackets have loosened from the years of vibration, those get reset and re-torqued before the door goes back up.
We don't push a full opener or panel replacement on a call like this unless the door itself is failing structurally, a spring job on a sound door is a sound repair, not a stopgap.
The Symptom
The most common call we get from this side of the service area is the door that won't budge and a metallic bang that happened right before it stopped, that's a torsion spring letting go. Close behind it: the door that drops unevenly, tilting to one side as it comes down, which usually means one cable has snapped or slipped off its drum while the other is still holding.
A door that reverses itself halfway up, or that the opener strains against without moving, points more at the spring than the motor, the opener isn't built to lift a garage door's full weight on its own, that's the spring's job, and once it's gone the opener just grinds. If the door is dead silent and the lights on the opener don't respond at all, that's electrical, not mechanical, and it's a different call.
Any of these on a house built in the late 1970s is worth taking seriously the same day, not the same week, because a partially failed spring under load is what causes the sudden full drop.
Time on the Job
A straight spring or cable replacement on a standard double door is a same-visit job once we're on site, it's mechanical work with known steps, not diagnostic guesswork. What takes longer on houses from 1979 is confirming that the rest of the hardware, drum, bearing plate, track alignment, hasn't drifted out of spec over the decades, since that check has to happen before we trust the new spring to the same mounting points.
We're honest about the one limitation here: if the original track or header bracket has rusted or cracked rather than just aged, that's not a same-visit fix. Ordering a matching bracket for hardware this old can mean a short parts wait, and we'd rather tell you that up front than force a part that won't hold.
Can You Do This Yourself
A stuck door with a broken spring is not a DIY repair, full stop. Torsion springs on a residential door are wound under several hundred pounds of tension, and releasing or resetting that tension with the wrong tools is how people lose fingers, not doors. If you can see the spring is intact but the door still won't move, checking that nothing's blocking the track or that the opener's safety sensors aren't misaligned is fair game for a homeowner.
What you can safely do yourself: pull the emergency release cord to manually lift the door if you need the car out before we arrive, then leave it manually operated and don't force the opener against a broken spring, that just adds strain to a cable that may already be compromised.
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Questions, answered
Why does an original 1979 door in Union City suddenly break with no warning?
Torsion springs are rated for a cycle count, not a calendar. A door original to a 1979 build has usually gone through decades of daily openings, and the spring reaches the end of its life on the inside before there's any visible sign on the outside. The bang you hear is the spring finally letting go.
Do you have a branch in Union City?
No. Pleasanton Garage Door Pros is based in Pleasanton and drives the roughly 9 miles into Union City for service calls. We don't operate a separate depot here, so the job is scheduled and dispatched from Pleasanton.
Should I replace just the broken spring or both?
On a double torsion spring setup we replace both, even if only one has broken. They're under matched tension and have logged the same cycles, so the second one is usually close behind. Replacing one and leaving the other is a short-term fix that tends to call us back.
Is a rusted track bracket a same-day fix?
Not always. A worn spring or cable is a same-visit repair, but if the original track or header bracket has rusted through or cracked, matching that hardware on an older house can require a short parts order. We'll tell you at diagnosis if that's the case rather than force a fit.
Tell Us What the Door Is Doing
Call and we'll ask a few questions before a truck leaves, then give you a straight answer on repair versus replace.