Discs have more stopping power. Drums are cheaper. So they put Drums in the back to cut cost. Its common in alot of cars to put discs up front and drums in the back because most of the braking is handled by the front wheels. High end sports cars have 4 wheel discs, as well as luxury cars, and other vehicles where the maunfacturer wants to put discs on all four wheels.

I'm not sure how their regen system works but in neither case does the type of brakes drum/disc matter in the regen. That is all handled in the transmission/motor combination by running the generator off the wheels (thus loading them and slowing them)

 

You may be surprised to hear that the FEH has Drum Brakes on the rear.
That's not a mistake.

The ( hand ) parking brake is a drum type brake.
There are small drum brakes inside the rear disc rotors.
They are called "drum in hat" type brakes.

Just thought you should be aware.

 

I don't think anyone here was referring to the parking brake... but that would explain why the parking brake is appears essentially useless for making sure the vehicle doesn't roll on any real incline.

 

I thought that was pretty much the standard, anytime you have rear discs.

 

This I knew. I also have to have them adjusted since my parking brake stopped working. The funny part about it was the service department didn't know they were there...