The emergency brake is a mini cable actuated drum brake the lives inside the rotor hat of the disk brake. Using the inside surface of the rotor hat at the drum braking surface. Really cool design and completely independent of the hydro disk brakes.
There are 2 adjustments; one on the rotor and one for cable stretch. The cable stretch described above is very easy to do. The drum brake adjustment a little more involved. After you remove the rear wheels you will see a little rubber plug on the rotor. Remove the plug. Rotate till you see the end of the wheel adjuster. A couple of click of the adjuster will take up the slack caused by wear, cant recall which way to make the adjustment. Google a detailed write up.
There are 2 adjustments; one on the rotor and one for cable stretch. The cable stretch described above is very easy to do. The drum brake adjustment a little more involved. After you remove the rear wheels you will see a little rubber plug on the rotor. Remove the plug. Rotate till you see the end of the wheel adjuster. A couple of click of the adjuster will take up the slack caused by wear, cant recall which way to make the adjustment. Google a detailed write up.

