Hydraulic system for vehicle

A vehicular hydraulic system, comprising:

• a first hydraulic drive device configured to be driven by a hydraulic pressure generated in a first hydraulic pump;
• a second hydraulic drive device configured to exhibit an action different from that of the first hydraulic drive device, and to be driven by a hydraulic pressure generated in a second hydraulic pump;
• and
• a single motor serving as a common power source for the first hydraulic pump and the second hydraulic pump,
• wherein a first hydraulic circuit including the first hydraulic pump and the first hydraulic drive device and a second hydraulic circuit including the second hydraulic pump and the second hydraulic drive device are separated and independent from each other,
• the first hydraulic drive device is implemented by a hydraulic brake which is allowed to be provided in a vehicle,
• the second hydraulic drive device is implemented by a hydraulic jack for adjusting a vehicle height of the vehicle,
• the hydraulic brake includes a first reservoir, in which oil is stored, connected to a brake caliper,
• a first intake valve that allows only an inflow of the oil from the first reservoir to the first hydraulic pump is interposed in an oil passage through which the oil is sucked from the first reservoir by the first hydraulic pump,
• the hydraulic jack includes a second reservoir in which oil is stored,
• a second intake valve that allows only an inflow of the oil from the second reservoir to the second hydraulic pump is interposed in an oil passage through which the oil flows from the second reservoir to a sucking port of the second hydraulic pump, and
• a reference negative pressure with which the first intake valve is opened due to sucking of the first hydraulic pump is set to be larger than a reference negative pressure with which the second intake valve is opened due to sucking of the second hydraulic pump.