Maintenance: the replacement of a new master cylinder, the road test found that radical step one foot brake pedal, brake well; but when a high-speed reducer, the first step on the foot brake Fortunately, the second step on the foot pedal feel very hard, brake problems, but also in the normal operation of the engine case, the first step on the foot brake pedal, the brakes feel normal, the role of booster; but then the second and third when the foot pedal, is made clear hardware, without a sense of power. This vehicle is used in a vacuum booster, after analysis, there should be no booster
Problems without braking power vacuum should the road is not smooth, flat and maintain the poor of the vacuum. Is because the vacuum booster engine intake manifold as the vacuum source, taking into account the engine has been running for 10 tens of thousands of km, suspected to be installed in the intake manifold connection pipe plug neck was caused by poor carbon deposition. Removed to connect it a look, really the case, carbon deposition tube was almost blocked. To control carbon deposition in the neck after cleared road test complex equipment, troubleshooting. According to this failure, it is recommended to those who make use of intake manifold vacuum power brake system as a source of vacuum trucks, moving more than 100,000 km, the connection should be kept clear vacuum tube neck, so as to avoid Failure, result in serious accidents.

 

Ground inspection, regular maintenance, the Director of useful service life of motor vehicles.