All of the e-brakes I have taken out of the cars were bare steel with the brake pedal 'dipped' in semi-gloss black paint to almost where it meets the bottom of the e-brake bracket. The housings were definitely bare steel.
On the brake pedals, all but one of the housings I have removed were bare steel and the pedals again dipped in black paint about 1/2 way up the brake pedal arms. Oddly enough, one unrestored Camaro brake pedal housing was dipped in black which I had never seen before.
Pictured is a (Chevelle) e-brake as removed and after restored. Also shown is the brake/clutch pedal.