Advanced driver-assistance systems (ADAS) are supposed to make driving safer, but “false braking” or “phantom braking” can do the opposite—triggering sudden, unexpected stops that put you and your passengers at risk. If your car has repeatedly slammed on the brakes for no reason, you are not alone, and you may be wondering what your options are under California’s lemon law. This article explains what false braking is, why it matters, and how California law generally treats brake-related ADAS defects—so you can make informed decisions about next steps.
ADAS False Braking: Why Your Vehicle May Be Unsafe
False braking occurs when systems like automatic emergency braking (AEB) or adaptive cruise control detect a hazard that isn’t there and apply the brakes anyway. It can happen under overpasses, in bright sun, around large trucks, near metal guardrails, or when lane markings are faded. Drivers describe it as a sudden, hard deceleration with no warning and no visible obstacle, sometimes accompanied by dashboard alerts.
This behavior can be dangerous. A surprise stop at highway speeds invites rear-end collisions, swerving, or loss of control—especially if someone is following closely behind you. Even when a crash doesn’t happen, repeated false braking can shake your confidence, reduce your willingness to use the features you paid for, and leave you anxious behind the wheel. That kind of safety risk can affect a vehicle’s use, value, and safety—the same factors California’s lemon law considers.
If you’re experiencing phantom braking, consider a few practical steps: document each incident with the date, time, location, weather, speed, and what the system displayed; ask the dealership to verify and repair the concern under warranty; and keep copies of all repair orders and software update notes. You can also check for recalls or technical service bulletins (TSBs) using your VIN on the NHTSA website, and file a safety complaint to help regulators track patterns. For immediate safety, review your owner’s manual to understand feature settings and limitations; do not disable any safety system unless the manufacturer’s instructions say it is safe to do so.
How California Lemon Law Treats ADAS Brake Defects
In California, the Song-Beverly Consumer Warranty Act (often called the California Lemon Law) generally covers new vehicles—and some used or Certified Pre-Owned vehicles still under the manufacturer’s warranty—when a defect that is covered by warranty substantially impairs the vehicle’s use, value, or safety, and the manufacturer can’t fix it after a reasonable number of repair attempts. Repeated false braking can fall into that safety category, especially if it keeps happening after the dealer has attempted repairs, re-calibrations, or software updates.
What counts as a “reasonable number” of attempts depends on the facts. California has a presumption for certain new vehicles within the first 18 months or 18,000 miles that can be triggered when, for example, the car has been out of service for an extended time or there have been multiple repair attempts (the thresholds vary, and safety-related issues may require fewer attempts). Even if your situation doesn’t fit the presumption, you may still have a claim based on the overall repair history. Potential remedies can include repurchase, replacement, or a cash settlement—though outcomes vary and depend on documentation, timing, and warranty coverage.
If you think false braking is making your vehicle unsafe, focus on building a clear record. Promptly report the problem to an authorized dealer, describe the conditions that trigger it, and ask for the results of any software updates, road tests, or sensor calibrations. Keep every repair order and note what the vehicle does after each visit. Don’t modify sensors or install aftermarket parts that could complicate diagnosis. If the problem persists, consider a consultation to review your warranty rights, options like manufacturer dispute programs, and timing issues (California’s statute of limitations can apply). For guidance tailored to your situation, you can contact ZapLemon for a no-obligation evaluation.
This article is for informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship with ZapLemon. Results depend on the facts of each case, and no outcome is guaranteed. If you believe your vehicle may qualify as a lemon due to ADAS false braking or other safety defects, contact ZapLemon at (310) 489-3017 or visit https://zaplemon.com to request a consultation and discuss your options under California law. Attorney advertising.