Prototype BOX Components 4-Piston Disc Brakes

BOX is also developing a 4-piston disc brake aimed at the trail/all-mountain/enduro crowd. The leading pistons are few millimeters smaller, which is said to provide more modulation and less initial bite since they contact first when the lever is pulled. The caliper weighs 66 grams without the pads. According to BOX, that's the lightest there is for a brake designed for trail/enduro use. A new rotor is also in the works, but isn't shown here.