Reverse brake assist is a safety feature found on some vehicles that helps to prevent accidents when reversing. It works by automatically applying the brakes if it detects an obstacle in the path of the vehicle. This can help to avoid collisions, and can also be useful if you need to stop quickly while backing up. There are many different types of reverse brake assist systems, and they can vary in terms of how they work and how effective they are. Some systems may only work at low speeds, while others may be able to operate at higher speeds as well.