Method of diagnosing brake booster based on its input and output, and braking system including diagnosing device capable of practicing the method

摘要

Method of diagnosing a booster of a braking system including a brake operating member operated with a brake operating force, a master cylinder 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 said booster, and a wheel brake cylinder which is activated by the hydraulic pressure produced by the master cylinder, to brake a vehicle wheel, wherein the booster is determined to be abnormal if the detected input and output of the booster do not meet a predetermined nominal relationship therebetween. Also disclosed is a diagnosing device capable of practicing the method.