Can Locked Truck Brakes Cause a Semi to Jackknife?
By John K. Rinehardt, Board Certified Civil Trial Attorney (NBTA)
11-11-26
How Brake Lockup Turns a Semi Into a Jackknife Hazard
Key Takeaways: Yes, locked truck brakes can cause a semi to jackknife. If some wheels stop rolling while others keep turning, the truck loses traction and stability. Ohio Rev. Code § 4513.20 says brakes must be kept in good working order and adjusted to work as evenly as practicable, and brakes on the rearmost vehicle must apply at about the same time as the towing vehicle’s brakes, or before them. Ohio Rev. Code § 4513.02 bans driving an unsafe vehicle on the road and bars anyone from causing or knowingly allowing it. The driver, the motor carrier, a repair shop, a parts maker, or a cargo loader may be liable. Under Ohio’s comparative fault rules, an injured person’s recovery is reduced by their share of fault and barred if their fault is greater than everyone else’s combined. Most injury and wrongful death claims in Ohio must be filed within two years, with limited exceptions, so it helps to preserve brake evidence early.
Yes, locked truck brakes can cause a semi to jackknife. When the wheels on one part of a tractor-trailer stop rolling while others keep turning, the truck can lose traction and steering control. The trailer may swing out, or the tractor may spin around toward the trailer. If you or a family member in Columbus or central Ohio was hurt in one of these crashes, it helps to know how brakes fail and what Ohio law requires of trucking companies.
If a semi jackknifed and hit you or a loved one, you do not have to sort out the brake evidence by yourself. Rinehardt Injury Attorneys helps injured Ohioans look into trucking negligence and hold the responsible parties accountable. Call 419-529-2020 or contact us now to talk about your situation.
Why Drive Axle Lockup and Trailer Swing Happen
A jackknife usually starts when braking force is no longer balanced across the truck’s axles. A tractor-trailer is two vehicles joined at a pivot point called the fifth wheel. When every axle brakes evenly, the truck slows in a straight line. When one set of wheels locks before the others, that balance breaks down.
When the Tractor’s Drive Axles Lock
Research listed by the Transportation Research Board (TRB) generally explains that drive axle lockup can push the tractor out of line. If the tractor’s rear wheels lock while the trailer wheels keep rolling, the trailer’s momentum pushes on the tractor at the fifth wheel. The tractor can then swing around toward the trailer and fold the rig into the familiar "jackknife" shape. Once a skidding axle starts sliding sideways, the driver often has little chance to recover.
When the Trailer’s Brakes Lock First
When the trailer brakes lock, a different danger arises, usually called trailer swing. Locked trailer wheels can let the trailer slide out to the side while the tractor keeps going straight. A swinging trailer can sweep across several lanes on I-70, I-71, or I-270 and hit cars that had nothing to do with the original braking. Federal rules generally require antilock brakes on air-braked truck tractors built on or after March 1, 1997, and on trailers built on or after March 1, 1998.
💡 Pro Tip: Photos of skid marks, tire marks, and where the tractor and trailer came to rest can help crash experts figure out which axle locked first. If you can safely take pictures at the scene, those images may become key evidence.
What Ohio Law Requires of Commercial Truck Brakes
Ohio sets brake rules for motor vehicles on its highways, including tractor-trailers. Under Ohio Rev. Code § 4513.20, vehicles must have brakes that can control, stop, and hold them. Interstate motor carriers must also follow federal brake, inspection, and maintenance rules, such as 49 C.F.R. Parts 393 and 396.
Key Brake Standards Under Ohio Rev. Code § 4513.20
Several parts of the statute relate directly to why semis jackknife.
| Provision | Requirement | Why It Matters in a Jackknife Case |
|---|---|---|
| § 4513.20(A)(1) | Two separate ways to apply the brakes, each working on at least two wheels | If one part fails, the truck should still have brakes |
| § 4513.20(A)(4)(a) | Trailers above the statute’s weight limit generally need brakes the driver can apply from the cab, plus brakes that apply on their own if the trailer breaks away, with limited exceptions | The driver must stay in control of trailer braking |
| § 4513.20(A)(6) | Rearmost brakes must apply at about the same time as the towing vehicle’s brakes, or first | Poor timing can let the trailer push the tractor or swing out |
| § 4513.20(A)(7) | Parking brakes must hold on any grade the vehicle is driven on, under all loads | Shows how strong brakes are expected to be |
| § 4513.20(A)(9)(a)-(b) | On dry, hard, level pavement, stop within 30 feet from 20 mph (brakes on all wheels) or 40 feet (not all wheels) | Gives a measurable standard |
| § 4513.20(A)(10) | Brakes kept in good working order and adjusted to work as evenly as practicable on opposite sides | Uneven brakes can cause lockup and loss of control |
The timing rule in § 4513.20(A)(6) may matter most in a jackknife case. If the trailer brakes lag behind the tractor’s, the trailer can push the tractor out of line. Likewise, under the even-adjustment rule in § 4513.20(A)(10), a carrier that skips brake maintenance may be breaking Ohio law. In Ohio, breaking a safety law that sets a specific duty can count as negligence per se. Even so, the injured person generally still has to prove the violation caused the crash and injuries.
Unsafe Vehicles and Roadside Inspections
Ohio law also bans putting an unsafe vehicle on the road in the first place. Ohio Rev. Code § 4513.02(A) makes it illegal to drive or move a vehicle on a highway when it is so unsafe that it endangers anyone. The ban also covers anyone who causes or knowingly allows it. Depending on what each party knew and controlled, the law may reach the driver as well as a carrier or anyone else who sent out a semi with faulty brakes.
State troopers can also order trucks to stop for inspection. Under Ohio Rev. Code § 4513.02(B), a driver must stop and submit the vehicle for inspection when a state highway patrol trooper says to.
Federal Attention to Truck Brake Failure
Federal regulators have long watched how well commercial truck brakes work. Federal rules already require carriers to regularly inspect, repair, and maintain their vehicles, and they treat out-of-adjustment brakes as a safety violation.
For an injured person, the lesson is simple. Truck brake failure is often not random. In many cases it comes from missed inspections, worn parts, out-of-adjustment brakes, or faulty repairs. Each of those causes may point to a person or company that may be legally responsible.
Who May Be Liable for a Jackknife Truck Accident
Liability depends on why the brakes locked and who controlled the truck’s condition. Brake problems are just one of the common causes of truck crashes on Columbus-area highways, and many crashes have more than one cause. Parties who may be responsible include:
- The truck driver, for braking hard at unsafe speeds, skipping pre-trip inspections, or driving a truck the driver knew was defective
- The motor carrier, for poor maintenance, pressure to skip repairs, or careless hiring and training, and often for the driver’s negligence on the job
- A maintenance or repair shop, for adjusting or installing brake parts the wrong way
- A parts maker, if a defective brake part or antilock system helped cause the lockup
- A cargo loader, if a badly spread-out load threw off braking balance
Ohio’s fault rules can affect how compensation is split among these parties. Under Ohio Rev. Code § 2307.23, the jury or judge may assign percentages of fault to the parties and, in some cases, to people who are not part of the lawsuit. Under Ohio Rev. Code § 2307.22, whether a defendant must pay the full amount or only its own share depends partly on its percentage of fault and the type of damages. Under Ohio Rev. Code § 2315.33, an injured person’s own share of fault reduces recovery, and it bars recovery only if that person’s fault is greater than the combined fault of all others.
💡 Pro Tip: Trucking companies may hold key evidence such as engine computer data, maintenance logs, and inspection reports. An attorney can send a letter asking the carrier to keep that evidence before its normal deadlines for discarding records pass.
Deadlines and Damages Ohio Families Should Understand
Ohio sets firm deadlines for filing injury and wrongful death claims. Under Ohio Rev. Code § 2305.10, a personal injury claim generally must be filed within two years after it arises. Under Ohio Rev. Code § 2125.02, a wrongful death claim generally must be filed within two years of the death. Limited exceptions exist, such as extra time for injured minors under Ohio Rev. Code § 2305.16, but waiting can put a claim at risk.
Damages in a truck brake case may cover both money losses and personal losses. Compensation may include medical bills, future care, lost wages, lost earning power, and pain and suffering. Ohio Rev. Code § 2315.18 generally caps noneconomic damages in personal injury cases, but the caps do not apply to certain catastrophic injuries. The caps generally do not apply to wrongful death claims, where surviving family members may seek compensation for loss of support, services, and companionship, along with their mental anguish.
Frequently Asked Questions
1. Can a jackknife happen even if the truck has antilock brakes?
Yes, in some cases. Antilock brakes are designed to reduce wheel lockup, but they can break down, be poorly maintained, or fail when a truck is going too fast or the trailer is loaded badly. An investigation can help show whether the system was working at the time of the crash.
2. What is the difference between drive axle lockup and trailer swing?
Drive axle lockup happens when the tractor’s rear wheels lock, which can let the trailer push the tractor out of line. Trailer swing happens when the trailer wheels lock and the trailer slides outward. Both can cause a jackknife.
3. How do I prove the brakes caused the crash?
Proof often comes from maintenance records, inspection reports, electronic data, a physical exam of the brake parts, and crash reconstruction. You still have to show that the brake problem caused the crash.
4. Can I still recover if I was partly at fault?
Possibly. Under Ohio Rev. Code § 2315.33, your recovery is reduced by your percentage of fault, and it is barred only if your fault is greater than the combined fault of all others involved.
5. How long do I have to file a claim in Ohio?
Most personal injury claims must be filed within two years under Ohio Rev. Code § 2305.10, and wrongful death claims generally within two years of death under Ohio Rev. Code § 2125.02. Exceptions are limited.
Holding Trucking Companies Accountable After Brake Lockup
Locked or poorly balanced brakes can turn a normal stop into a violent jackknife, and Ohio law sets clear rules for how truck brakes must work. When a driver, carrier, or repair shop falls short, injured people may have grounds to seek compensation. Working with a jackknife truck accident lawyer early can help save brake evidence before it is lost.
If you or a family member was hurt in a semi crash in Columbus or anywhere in central Ohio, getting answers now can protect your options later. Rinehardt Injury Attorneys is ready to review what happened and explain your next steps. Call 419-529-2020 or schedule your free consultation today.
Disclaimer: This content is for informational purposes only and is not legal advice. Every case is unique, and results may vary. Consult an attorney about your specific circumstances.
