2021 Tesla Model 3 service brakes problems

“Urgent Safety Concern — Uncommanded Braking During Manual Driving. On October 2, 2026, while driving my 2021 Tesla Model 3 Standard Range manually at approximately 45 mph and slowing to make a turn at an intersection, my vehicle unexpectedly applied very strong braking for approximately 1–2 seconds before releasing. Neither Autopilot, FSD, nor Traffic-Aware Cruise Control was engaged. I am concerned about a possible unintended Automatic Emergency Braking activation or braking-system malfunction. This creates a serious safety concern for my family, including our newborn child. I request that this be urgently reviewed and determine what triggered the braking, including whether AEB, ABS, or another braking-control system intervened in suck similar cases, so many were reported online. Please also provide the diagnostic findings and a written assessment of whether the vehicle is safe to operate.”

“As we were normally driving, the car lost power immediately with no warning sign. After the power is lost, brake does not function, electrical door button doesn't function, hazard light doesn't function. Car was able to scroll to a complete stop to the side of the road. The steering wheel is locked. Again, BRAKE DID NOT FUNCTION after the power is lost. No button works, no screen turns on, car is not able to turn to neutral. There was no collision prior and no warning prior. Tried to file a police report. But Officer [XXX], badge # XXX, refused due to there was no collision and no accident.”

“The forward-facing camera and Autopilot computer system on my 2021 Tesla Model 3 has failed. The dashboard first showed intermittent warnings that "Automatic Emergency Braking is currently unavailable" and "Adaptive headlight features are unavailable." Over several weeks the problem worsened from intermittent to constant, and the vehicle progressively lost its forward road visualization and all active safety features. Using the vehicle's Service Mode diagnostics, the Autopilot computer's Primary (A) processing node reports a "CRITICAL" status. The fault log records repeated alerts including dasMIA (driver-assistance system not responding), aebFault (automatic emergency braking fault), and fisheyeCamInitFault and fisheyeCameraStreamExit (forward camera initialization and stream failures). The cameras themselves are physically clean and unobstructed. Safety risk: the failure disables Automatic Emergency Braking and forward collision avoidance, lane-keeping/driver assistance, and the adaptive auto high-beam headlights. AEB is a critical crash-avoidance system; losing it leaves the vehicle unable to brake automatically for an imminent collision, and the loss of…”

“I drove into my neighbor’s driveway to drop her off. As I slowed down and applied the brakes to stop, the car failed to respond. It continued forward, running over the flower and plant pots at the edge of the driveway, crossing the backyard, and finally colliding with the trees and bushes at the rear of the property. All airbags deployed, and the vehicle was damaged beyond repair.”

“What component or system failed or malfunctioned, and is it available for inspection upon request? - ABS, Automatic Emergency Braking, Traction Control, Stability Control failed while braking using the regenerative braking. How was your safety or the safety of others put at risk? - While coming to a stop using the regenerative braking, the regenerative braking immedietely ceased to work, and the driver had to immediately apply the hydraulic brakes to avoid a rear end collision Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? - No Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? - No, they appeared while braking. This issue is not new to this vehicle and has happened in the past, however the errors cleared themselves out.”

“On [Wednesday, 07/09/2025], I was driving my Tesla Model 3 in rainy conditions when the vehicle suddenly swerved and crashed into a sidewall. The road was wet but not flooded, and I was traveling at a moderate speed. As I lifted my foot off the accelerator to slow down, the car's regenerative braking system engaged abruptly, which I believe shifted weight forward and caused the rear tires to lose traction. This led to hydroplaning and complete loss of control. There were no warning lights or alerts prior to the incident. The road surface did not have visible hazards or standing water that would typically explain a spinout. The tires were moderately worn but within usable limits. As a result of the crash, the car was declared a total loss. The insurance company now has possession of the vehicle. Thankfully, no one was injured, but the crash was severe. After the incident, I researched similar cases and found multiple reports and articles (e.g., AutoEvolution) linking Tesla’s regenerative braking to increased risk of hydroplaning or loss of control in wet or slippery conditions. The regen system eliminates coasting and applies braking force immediately upon…”