Braking system for motorcycle

When an operation amount of a first operation member (18) is smaller than a predetermined operation amount, the control unit (28) causes an association mechanism (22) not to supply hydraulic pressure to a second braking force generating mechanism (36). When the operation amount of the first operation member (18) is equal to or higher than the predetermined operation amount, the control unit (28) causes the association mechanism (22) to supply hydraulic pressure to the second braking force generating mechanism (36).