Regenerative Braking Video

In this video a Toyota representative explains how the regenerative braking system in a modern Camry sedan works. The brake system uses both electric and mechanical parts. They say that 80% of the braking is done by the recoverable electric system, with the last 20% provided by a standard mechanical pressure based system. Although when he says that the regenerative braking works by converting heat in the brakes to stored energy, I am almost certain he is oversimplifying. Normally regenerative braking systems work by using the rotational kinetic energy stored in the drivetrain to run a generator, which then charges the battery.