On [XXX], at approximately [XXX], I was driving westbound on the [XXX], just before the [XXX] and [XXX] off-ramp, with my wife and our [XXX] baby in the car. While in traffic, I noticed the regenerative braking system was not slowing the vehicle down adequately, despite having a clear and sufficient distance from the big rig ahead of us. As the gap closed, I slammed down on the brake pedal, but it felt abnormally stiff and did not respond with the urgency or force expected. The vehicle failed to stop in time, resulting in a rear-end collision with the big rig. Thankfully, we were not injured due to the speed of the accident. The breaks have not been inspected due to it being in the collision center There was an alarm but it sounded off too late and the car ended up colliding. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)