Through an example about the practical application of an automobile brake performance testing system, this paper explores the serial communication between Microsoft Comm-control controlware used by master-control computer under Visual Basic in the microcomputer test and control system and AT89C51 single-chip microcomputer with compilation programming.

Introduces the construction and principle of the instrument for testing the force and range of the automobile brake pedal and its calibrater as well as the methods of calibrating and testing the brake pedal range.

An automobile brake measure & test system is developed based on the design of wheel force transducer,and system software is developed with OOP language.

An algorithm of computing the average frequency of motor vehicle brake oil pressure is expounded, by which the increase of oil pressure, steady and reductive frequency in a moment of a motor vehicle braking is also given.

The Knowledge Base Construction of Auto Brake Expert System and Its I/O Interface Design;

Research and Development of the Inference Engine of Object-oriented Auto Brake Expert System;

By combining practice of auto brake expert system,the knowledge bases of auto brake master cylinder stroke and brake pedal stroke were proposed in the development environment of Visual Studio.