The bike is shipped with Shimano Deore Mechanical Disc on the front. But for long down hills you should set the bike up with a drag brake. change out the rear wheel to use a tandem hub so you can mount a Arai drum brake on the rear wheel. The disk brakes will over heat if used as drag brakes on long down hills.
Check with Wiz Wheels to make sure that it will fit before you order the bike.
"When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking." - Arthur Conan Doyle