A crooked garage door where one side hangs lower than the other at the closed position usually points to a problem with the bottom bracket, lift cable, or track alignment on that side. The door panel tilts because the lifting mechanism on one side is not raising or lowering at the same rate as the other, often due to cable slack, bracket deformation, or roller binding. You’ll notice the gap between the door and floor is uneven when closed, and the door may bind or squeak during travel as the misaligned side drags.
How Bottom Brackets and Lift Cables Work Together
Each side of the door has a bottom bracket bolted to the lowest panel. A steel lift cable attaches to this bracket, runs up to the top corner of the door, and connects to either the torsion spring shaft (via a drum) or an extension spring and pulley system. When the door moves, the cable winds or unwinds, lifting the door evenly. If the bracket bends or the cable frays, that side loses tension, causing the door to tilt.
Common Causes of a Crooked Door
Bottom brackets can bend from impact—like a car bumper hitting the door—or corrode over time, especially in coastal Metro Vancouver where salt air accelerates rust. Lift cables develop frayed strands from rubbing against misaligned rollers or brackets. Sometimes the issue isn’t the bracket itself but a loose bolt allowing the bracket to shift, or a roller that’s come out of the track, causing the cable to slip or bind.
What You Can Safely Inspect Yourself
With the door fully closed and disconnected from the opener (pull the emergency release cord), check each bottom bracket for visible bending, rust, or loose bolts. Look at the lift cables where they attach—fraying, kinks, or broken strands mean replacement is needed. Spin the rollers by hand; they should turn freely without wobble or grinding. Never attempt to loosen or tighten brackets while the door is under spring tension.
When the Problem Is Actually the Track
If the brackets and cables look intact, inspect the vertical track on the low side. A gap between the roller and track, or rollers riding on the lip instead of inside the channel, indicates the track has shifted inward or outward. Loosen the track bolts slightly, tap it back so rollers sit snug but not pinched, then retighten. Track misalignment often mimics a bracket problem because it binds the roller and cables on one side.
Why DIY Repairs Have Limits Here
Adjusting or replacing bottom brackets and lift cables requires managing spring tension. Torsion springs store deadly force—if a winding bar slips, it can cause severe injury or death. Extension springs, while less violent, still launch parts with significant energy. Even if you replace a bracket, the cable must be reattached with correct tension; too loose and the door sags, too tight and it binds the motor or bends the panel. These are not cable TV or shelf-installation jobs.
Signs You Need a Professional Technician
Call a technician if cables are frayed, brackets are bent or pulled away from the panel, rollers are seized or shattered, or the door binds mid-travel. A pro will safely release spring tension, inspect the shaft and drums for wear, replace cables and brackets with galvanized or stainless steel suited to BC’s climate, and realign the track system. They’ll also check panel integrity—long-term sag can crack or warp the door section.
Frequently Asked Questions
Can I lubricate the bottom bracket or cable to fix the crook?
Lubricant won’t correct a bent bracket or frayed cable; it only reduces friction in moving parts like rollers, hinges, and springs. Applying grease to cables actually attracts dirt and accelerates wear. Focus on visual inspection and mechanical alignment instead.
Will tightening the bolts on the bottom bracket solve the problem?
If the bracket is loose but not deformed, tightening the bolts to manufacturer torque may restore alignment. However, if the bolt holes are elongated or the bracket is bent, tightening alone won’t fix it—the bracket needs replacement to maintain proper cable angle and tension.
How long do bottom brackets and lift cables typically last in Metro Vancouver?
In our climate, galvanized bottom brackets and steel lift cables last 10-15 years with minimal exposure to salt spray. Coastal areas or industrial zones may see reduced lifespan due to corrosion, making annual inspection of these components prudent for strata councils and homeowners.