 Honda’s first street motorcycle with a combined braking system (then called Unified Braking) was the 1983 Gold Wing GL1100.This system was derived from a 1970s RCB1000 world endurance race bike.The DCBS system was introduced to assist rider braking where the front brake lever operates two of the three pistons on the front calipers but also proportionally applies pressure to one piston of the rear brake caliper, while using the rear brake will engage one piston in front calipers and two pistons on the rear.