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Apparatus for diagnosing a booster of a vehicle braking system including a brake pedal, a master cylinder for producing a hydraulic pressure on the basis of an output force of the booster produced by boosting of a brake pedal operating force by the booster, and a wheel brake cylinder activated by th

Apparatus for diagnosing a booster of a vehicle braking system including a brake pedal, a master cylinder for producing a hydraulic pressure on the basis of an output force of the booster produced by boosting of a brake pedal operating force by the booster, and a wheel brake cylinder activated by the hydraulic pressure to brake a vehicle wheel, wherein a determining device is adapted to make a provisional decision as to whether the booster is abnormal or not, on the basis of a relationship between an input quantity and an output quantity of the booster, and a optimizing device is adapted to determine the provisional decision as a final decision or rectifying the provisional decision.

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[ What is claimed is:] [1.]1. An apparatus for diagnosing a booster of a braking system for an automotive vehicle, said 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 output force of sai

[ What is claimed is:] [1.]1. An apparatus for diagnosing a booster of a braking system for an automotive vehicle, said 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 output force of said booster produced as a result of boosting of said brake operating force by said booster, and a wheel brake cylinder which is activated by the hydraulic pressure produced by said master cylinder, to brake a wheel of the automotive vehicle, said apparatus comprising:a determining device for making a provisional decision as to whether said booster is abnormal or not, on the basis of a relationship between an input quantity relating to an input of said booster and an output quantity relating to an output of said booster; andan optimizing device for determining said provisional decision as a final decision or rectifying said provisional decision.