Braking control system for an automotive vehicle

A braking control system for controlling a braking force applied to each of front and rear wheels of an automotive vehicle, comprising:

• front wheel brake cylinders operatively mounted on said front wheels for applying the braking force thereto, respectively;
• rear wheel brake cylinders operatively mounted on said rear wheels for applying the braking force thereto, respectively;
• pressure generating means for pressurizing brake fluid in response to operation of a manually operated member to generate a hydraulic braking pressure and supply the hydraulic braking pressure to each of said front and rear wheel brake cylinders;
• an auxiliary pressure source for pressurizing the brake fluid irrespective of operation of said manually operated member to generate a power pressure;
• braking operation detection means for detecting the operation of said manually operated member and the operating conditions thereof;
• wheel speed detection means for detecting wheel speeds of said front and rear wheels of said vehicle;
• slope detection means for determining whether said vehicle is on a slope, when the rear end of said vehicle is located downward;
• stop holding means for holding the wheel speeds of said rear wheels to be zero by supplying the hydraulic braking pressure discharged from said auxiliary pressure source to said rear wheel brake cylinders, when said slope detection means determines that said vehicle is on the slope, with the rear end of said vehicle located downward, when said braking operation detection means detects the operation of said manually operated member, and when it is determined on the basis of the wheel speeds detected by said wheel speed detection means that the wheel speeds of said front wheels are zero and that the wheel speeds of said rear wheels are not zero;
• and
• stop cancellation means for decreasing the hydraulic braking pressure in said rear wheel brake cylinders in response to the operating conditions of said manually operated member detected by said braking operation detection means, when said vehicle is moved after said stop holding means had the wheel speeds of said rear wheels to be zero.