BRAKING SYSTEM FOR AN AUTOMOTIVE VEHICLE INCLUDING DIAGNOSING DEVICE

摘要

A braking system for an automotive vehicle is provided herein. The braking system includes a brake operating member, a booster including an input rod and operable to boost a brake operating force acting on the brake operating member. A master cylinder is provided for producing a hydraulic pressure on the basis of an input force received from the booster as a result of boosting of the brake operating force by the booster. A wheel brake cylinder is activated by the hydraulic pressure which is produced by the master cylinder, to brake a wheel of the automotive vehicle. The brake system includes a connecting member connecting the brake operating member and the input rod to each other. It is configured so as to permit a relative movement between the brake operating member and the input rod of the booster in an axial direction of the input rod by a predetermined maximum distance. A pivotal member is connected to the brake operating member such that the pivotal member is configured pivotal about an axis which is perpendicular to the axial direction of the input rod, on the basis of the relative movement between the brake operating member and the input rod. A booster- diagnosing device is provided for detecting an input and an output of the booster, and for determining that the booster is abnormal, if the detected input and output do not meet a predetermined nominal relationship therebetween. The booster diagnosing device includes a signal generating device fixed either to the brake operating member or the pivotal member. The signal generating device is configured to operate in response to a relative movement between the brake operating member and the pivotal member which is caused by the relative movement between the brake operating member and the input rod. The signal generating device generates an output signal relating to the brake operating force as the input of the booster, depending upon the distance of the relative movement between the brake operating member and the input rod.