2026-03-18 6 min read
A lot of garage door breakdowns come with some warning. the problem is most homeowners don't know what to look for. Nowhere is this more true than with garage door springs. Springs are the most mechanically stressed component of your entire door system, and when one fails, it usually does so loudly and completely. In San Dimas, we see spring failures spike in two windows: after the summer heat cycle stresses the metal, and in late winter after sustained moisture from the February rains accelerates corrosion.
The good news is that springs almost always give you signals before they snap. Here's what to watch for.
Your garage door weighs between 150 and 300 pounds depending on the material and size. Springs. either torsion springs mounted horizontally above the door or extension springs running along the side tracks. counterbalance that weight so the opener motor doesn't have to lift it alone. When you press the button, the opener does about 10% of the work; the springs do the other 90%.
Springs are rated by cycles. One cycle equals one full open and close. A standard spring is rated for around 10,000 cycles. which translates to roughly 7 to 10 years for a household that uses the garage door 2 to 4 times per day. Many homes in San Dimas, especially the established ranch-style properties built in the 1960s through 1980s, have original or first-replacement springs that are well past that window.
If your home is in that age range and you've never thought about the springs, it's worth a look.
This is the most reliable early warning. Disconnect the opener by pulling the red emergency cord, then try to lift the door manually to about waist height and let go. A properly balanced door will stay in place or drift very slowly. If it drops quickly or feels like you're lifting something far heavier than usual, the springs are likely losing tension and no longer counterbalancing the door's weight properly.
Don't keep using the opener if the door feels heavy manually. you're making the motor compensate for the spring's failure, and that significantly shortens opener life.
Many San Dimas homeowners describe this as sounding like a gunshot or a large book dropping from a shelf. That sound. especially if your door then won't open. almost certainly means a torsion spring has snapped under tension. Springs store a tremendous amount of mechanical energy, and when one breaks, it releases that energy all at once.
If you hear this sound, stop using the door immediately. Operating a door with a broken spring can damage the opener, bend the tracks, and create a genuine safety hazard. This is one of those situations where you call a professional the same day. take a look at how we handle urgent repairs if you find yourself in this situation.
Take a moment to look at your torsion spring. the horizontal bar above the door. If you see a gap in the coil, the spring has already broken and needs replacement before you use the door again. Rust on the spring is a serious warning too. A corroded spring is more brittle and far more prone to sudden failure. San Dimas winters, while mild compared to most of the country, bring enough moisture in December through February to accelerate rust on springs that aren't properly lubricated.
Visually inspect the springs every few months. it takes about 30 seconds and can save you a lot of trouble. If you notice rust forming, a silicone-based lubricant can slow the process, but corroded springs generally need replacement sooner rather than later.
If one side of the door rises faster than the other, or the door seems to lurch during operation, extension springs are often the cause. Extension springs run in pairs, one on each side of the door, and they tend to wear unevenly. When one weakens before the other, the door pulls more to the stronger side. You may also notice the door sitting slightly crooked when closed.
Uneven movement puts added stress on the cables, rollers, and the opener carriage. so what starts as a spring issue can cascade into other repairs if left alone. Many homeowners in the area, including those near La Verne where we also work regularly, are surprised to find that catching the spring issue early saves two or three other components.
For more on what a full system check involves, our services page breaks it down.
If your opener sounds like it's working harder than normal. a labored hum, a hesitation, or a safety-stop that kicks in halfway through the cycle. the motor is likely compensating for a weakened or broken spring. Many modern openers have a built-in force-sensing feature that stops the motor when it detects unusual resistance. This is a safety feature, but it's also a useful diagnostic signal.
Don't dismiss a door that stops mid-lift as an opener problem until the springs have been ruled out. Replacing a spring is almost always less expensive than replacing a burned-out opener motor.
If you spot any of the warning signs above, the right move is to stop using the door and call a professional. Garage door spring replacement is not a DIY project. Springs are under enough stored tension to cause serious injury if released improperly. a standard 150 to 300-pound door can drop suddenly without spring support, and the coiled tension in a torsion spring can cause severe harm if the winding bars slip.
A professional technician will also advise replacing both springs at the same time, even if only one has failed. Springs wear at roughly the same rate, so if one has given out, the other is close behind. Replacing both during one service call is more cost-effective and prevents you from calling again three months later.
If you have questions about what to expect. cost, timing, what type of spring your door uses. check out our frequently asked questions or get in touch directly. Garage Door San Dimas services the whole San Gabriel Valley foothill area and can typically get to you the same day for spring failures.
Most standard springs are rated for around 10,000 cycles, which works out to 7,10 years under typical household use. Homes with heavy daily use, or those with doors exposed to significant winter moisture, may see springs wear out sooner. If your home was built between the 1960s and 1990s. which covers a large portion of San Dimas's housing stock. and the springs have never been replaced, it's worth having them inspected.
No. Operating a garage door with a broken spring puts severe strain on the opener motor and can lead to sudden, uncontrolled door movement. The door should not be used until the spring has been replaced by a professional.
Yes, and most reputable technicians will recommend this. Springs in a pair wear at approximately the same rate, so if one breaks, the other is typically near the end of its life as well. Replacing both at once saves you labor costs and prevents a second failure shortly after the first.