Brake fluid pressure control device

Claim 1

A brake fluid pressure control device comprising: a main flow path for connecting, as one system, a first wheel brake of a driving wheel and a second wheel brake of a driven wheel with a master cylinder; a first reservoir which is provided on the main flow path; fluid pressure adjusting means for selectively communicating the first and second wheel brakes with the master cylinder and the first reservoir, which is provided on the main flow path; a pump which sucks and pressurizes brake fluid in the first reservoir so as to discharge the brake fluid to a junction of the main flow path and the pump; the junction being disposed closer to the master cylinder than the fluid pressure adjusting means; a second reservoir for storing the brake fluid, which is communicated with the fluid pressure adjusting means and the second wheel brake; a directional control valve which is provided on the main flow path at one side of the function adjacent to the master cylinder; the directional control valve being adapted, in a first state, to enable communication between the master cylinder and the fluid pressure adjusting means and, in a second state, to interrupt communication between the master cylinder and the fluid pressure adjusting means; and control means, operative at the time of traction control of the brake fluid pressure control device, for setting the directional control valve to the second state and driving the pump so as to supply the brake fluid in the second reservoir to the first wheel brake through the fluid pressure adjusting means.