My Car Brakes on Its Own for No Reason. Is Phantom Braking a Lemon Law Issue?

Published October 19, 2026 · Updated October 19, 2026 · California lemon law

The Short Answer

Signs Your Phantom Braking Problem May Qualify

• The car braked hard, or beeped a collision warning and braked, with nothing ahead
• It happened more than once, on different roads or days
• You reported it to an authorized dealer, even if they found nothing
• The dealer recalibrated a sensor or camera, or updated software, and it happened again
• The car is under the new car warranty, or the problem started while it was
• You have dash camera footage, a passenger witness or notes from each event

What Phantom Braking Is and Why It Happens

Phantom braking is the name owners give to sudden, unexpected braking by the car's driver assistance systems. Most new cars have forward collision warning and automatic emergency braking. Many also have adaptive cruise control that slows the car to match traffic. These systems rely on cameras, radar and sometimes other sensors to decide whether something is in your path.

When those systems misread the road, the car can brake hard for no reason. Owners describe it happening under overpasses, near shadows, on curves, around parked trucks, at hill crests and in bright sunlight. Some cars only slow sharply. Others brake hard enough to throw things off the seat. Either way, the driver behind you is not expecting it.

You do not need to know which sensor is at fault. In Oregel v. American Isuzu Motors (2001), a California court held that the buyer does not have to prove the exact technical cause of the defect. What you need is a clear record that the car did this, that you reported it, and that the repairs did not stop it.

It also helps to understand that phantom braking is different from a brake failure. The brakes themselves work. The problem is the computer deciding to use them when it should not. That distinction matters because dealers sometimes inspect the pads, rotors and fluid, find them fine, and close the ticket. Make clear on each visit that the complaint is unexpected automatic braking, not worn brakes.

Why Phantom Braking Is Usually a Safety Defect

The Song-Beverly Consumer Warranty Act (Civil Code 1790 and following) is California's lemon law, and it applies when the manufacturer or its dealers cannot fix a warranty defect that substantially impairs a new or leased vehicle's use, value or safety after a reasonable number of attempts. Unexpected hard braking at freeway speed checks the safety box in an obvious way.

That matters because of the Tanner Act presumption in Civil Code 1793.22(b). Within 18 months or 18,000 miles, whichever comes first, a reasonable number of attempts is presumed if a defect likely to cause death or serious bodily injury was subject to repair two or more times. For other defects, the presumption needs four repairs or more than 30 days out of service. One condition applies to the repair-count paths: if the owner's manual clearly requires direct notice to the manufacturer, you must have sent it.

If the standard is met, the manufacturer must replace or repurchase the car, and you can choose a buyback (Civil Code 1793.2(d)(2)). Outside the 18 month, 18,000 mile window, a claim can still succeed if the defect first showed up while the warranty was in force.

Phantom braking also changes how you drive. Many owners stop using cruise control or turn off the safety features they paid for. That loss of use and value is part of the picture, and you should mention it to the dealer and to your attorney.

What to Tell the Dealer About Each Event

Phantom braking is hard to reproduce on a short test drive, so your description has to do most of the work. Give the advisor specifics, and ask them to copy your words onto the repair order.

• Speed and road type: 'about 65 mph on the freeway, adaptive cruise on.'
• What triggered it, if anything: overpass, shadow, truck in the next lane, curve.
• How hard it braked and whether a warning sounded first.
• What happened behind you: 'car behind had to swerve.'
• How many times it has happened and on what dates.
• Whether you now avoid using cruise control or driver assistance because of it.

Recalibrations, Updates and Repairs That Count

Dealers usually respond to phantom braking with one of three fixes: recalibrating the front camera or radar, replacing a sensor, or updating software. Each one is a repair attempt when it is done for your complaint. Our firm's position is that a software update, including an over-the-air update, can count as a repair attempt when it was meant to fix the reported problem. Save the update notice and the date.

Recalls can matter here too. Some driver assistance problems have been the subject of safety recalls, and recall repairs can count as repair attempts. Look up your VIN on the NHTSA recall site. A technical service bulletin is different. It is a repair instruction to dealers for a known issue, not a safety recall, but if one applies to your car, ask that the repair order mention it.

Be careful with outside work. If a glass shop replaced your windshield, ask the dealer to check the camera calibration and to note the result. If an independent shop worked on the sensors, keep the receipt, but know that repairs at an independent shop, or done yourself, do not count as repair attempts under the lemon law.

Example: An SUV That Braked Under Overpasses

This made-up example shows the process; the driver is not a real client. Tom bought a new SUV in Orange County. Using adaptive cruise on the 405, the car twice braked hard as he passed under an overpass, with nothing ahead. The second time, the driver behind him had to swerve.

Tom saved his dash camera clips and took the SUV to the dealer. The first repair order said the front radar was recalibrated. Two weeks later it happened again on a different freeway. On the second visit, the dealer installed a software update and road tested the car without any event. Tom asked that the order describe the near collision, and it did.

His owner's manual asked owners to report repeated problems directly to the manufacturer, so Tom sent a short letter with the dates of both visits. After a third event, he called a lemon law attorney, who reviewed his purchase contract, repair orders, clips and letter, and contacted the manufacturer. This example shows how a safety defect record is built. It should not be read as predicting any result.

Notice that Tom never tried to explain the radar or camera. He simply described what the car did, where and when, and let the clips speak for him. His three repair orders each named the same complaint in the same words, which made it easy for anyone reading them to see that one defect kept returning.

Using NHTSA Reports and Other Owners' Complaints

The National Highway Traffic Safety Administration accepts safety complaints from owners at nhtsa.gov. Filing one takes a few minutes and creates a public record of your event. It does not replace a dealer visit and it is not a repair attempt, but it is a useful way to put the manufacturer and regulators on notice that the problem exists.

NHTSA's site also lets you read complaints others have filed for the same model. If many owners report phantom braking under similar conditions, that pattern can help show the problem is a real defect and not something about how you drive. A lemon law attorney may look at those complaints when reviewing your case.

Whatever you file, keep it factual and consistent with your repair orders. Use the same dates, speeds and descriptions. Consistency across your notes, the dealer's records and any public report makes your account easier to trust.

Finally, think about witnesses. If a passenger was with you, ask them to write down what they saw while it is fresh. If another driver stopped to check on you after a near miss, a name and phone number can help later. None of this is required, but it adds weight to an event the dealer could not reproduce.

If your car lets you save a driving or event report, such as a dash camera clip tied to a collision warning, download it before it is overwritten and bring a copy to the dealer.

Refunds, Fees and Staying Safe in the Meantime

If the manufacturer has to buy the car back, restitution is the actual price paid or payable, including collateral charges like sales tax, license and registration fees, plus incidental damages such as reasonable towing and rental costs (Civil Code 1793.2(d)(2)(B)). The manufacturer can subtract a mileage offset based on the miles you drove before you first reported the problem (Civil Code 1793.2(d)(2)(C)). Every case turns on its own facts and paperwork.

Under Civil Code 1794(d), a buyer who wins recovers attorney fees and costs from the manufacturer. Our clients pay $0 out of pocket, and when we do not win, the client owes us nothing.

While the claim is open, ask the dealer whether it is safe to keep driving the car and whether you should turn off certain features. Follow the owner's manual, leave extra space behind you, and keep making your loan or lease payments so your credit stays protected.

If the dealer offers a loaner while your car is in for phantom braking, take it, and ask that the loaner be noted. If you rent a car on your own because you no longer feel safe in yours, keep the receipt and tell your attorney why you made that choice.

What to Do Next

1. After any event, pull over when safe and write down the time, speed, road, weather, lighting and what was ahead, such as a shadow, overpass or parked car.
2. Save dash camera footage right away, since many cameras record over old clips.
3. Take the car to an authorized dealer and ask that the order say 'vehicle braked hard on its own with no obstacle, risk of rear-end collision.'
4. Ask whether a recall, software update or technical service bulletin applies, and have any work listed on the repair order.
5. Consider filing a report with NHTSA at nhtsa.gov, and keep a copy of what you submit.
6. Call 877-536-6620 to set up a free case review and go over the details directly with an attorney.

Key Facts (as of October 2026)

• Within 18 months or 18,000 miles, two repairs of a defect likely to cause death or serious injury create a presumption that the manufacturer had a reasonable number of attempts (Civil Code 1793.22(b)).
• A recall is a manufacturer safety repair program, and recall repairs can count as repair attempts.
• A buyer need not pinpoint the exact technical cause of the defect (Oregel v. American Isuzu Motors, 2001).

Talk to a Lemon Law Attorney Today

You speak directly with an attorney. Our attorneys, listed in firm order: #1 Jacob Shayesteh (founding attorney), #2 Armig Khodanian and #3 Kamau Edwards, will look at your repair history and tell you honestly whether you have a case. The review is free. You pay $0 out of pocket: the manufacturer pays the attorney fees when you win, and if we lose, you owe us nothing.

What Our Clients Say on Google

“He helped me obtain all of my repair records and purchase documents through the vehicle's app within the hour and officially started my California Lemon Law case the same day. The entire process was straightforward and stress-free, and I never had to deal directly with the manufacturer.”

Miki B. · Lemon law client · 5-star Google review

“My husband spoke with Jacob directly, and the process could not have been easier. He handled everything from start to finish and was able to secure a full buyback for the family.”

Jen B. · Family vehicle · 5-star Google review

“I was actually able to speak directly with an attorney and the owner of the law firm. He took the time to clearly explain the Lemon Law process, organized everything step by step, and made sure I fully understood my options.”

Brandon R. · Lemon law client · 5-star Google review

Read all 78 reviews on Google (5.0 stars, October 2026). Reviews describe past clients' experiences; every case is different.

FAQ

Does it count if the dealer could not reproduce the phantom braking?

It can. Visits where the dealer could not find or fix the problem can still count, so make sure your complaint is written on the order.

Should I turn off automatic emergency braking?

Ask the dealer and check the owner's manual first, because the feature also protects you. If you do turn off a feature because of the defect, tell your attorney.

Is a camera recalibration after a windshield replacement a repair attempt?

A recalibration done by an authorized dealer for your phantom braking complaint can count. Work done by a glass shop or other independent shop does not.

Does filing an NHTSA complaint start a lemon law claim?

No. An NHTSA complaint is a safety report to the federal government. A lemon law claim is made against the manufacturer, usually with help from a lemon law attorney.

Sources and Official References

• California Civil Code section 1793.22 (California Legislature)
• California Civil Code section 1793.2 (California Legislature)
• NHTSA, report a vehicle safety problem
• NHTSA recall lookup by VIN

Laws change. This page reflects California law as of October 2026 and was reviewed by Jacob Shayesteh, Esq.

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Attorney advertising. Wynn Law Group, APC, 10850 Wilshire Blvd, Suite 1010, Los Angeles, CA 90024. General information, not legal advice. Results vary. Prior results do not guarantee a similar outcome.