Symptom:
    An automatic block Santana Junjie car in the driving brake weak, hard, emergency braking when the vehicle can not stop, the vehicle without locking phenomenon, ABS no work phenomenon, the above failure has been repaired can not be resolved.
    Troubleshooting:
    The vehicle inspection, dismantling the front and rear wheel brakes, brake pads are very good, the vehicle brake fluid has also been replaced, ABS hydraulic pump is also the same type of vehicle for the results of the fault remains the same. Finally, the brake vacuum pump was carefully checked and found that the shell has a concave place. Vehicle brake powerless, pedal hair hard is likely with the vacuum booster vacuum suction is too small, so unplug the booster vacuum tube, found that this car compared with other vehicles, the engine vacuum suction is too small. Because this car mileage is only 34798km. The engine starts normal, idle speed, in the acceleration of the engine without abnormal phenomenon. So first with the engine vacuum table to detect the vacuum of the engine, the engine at idle speed is only about 21kPa vacuum, and the normal value of a large difference, but the rapid acceleration of vacuum, through the detection of each cylinder pressure is maintained at 810kPa or so, and Normal contrast is very different. In accordance with the common sense of the car four cylinders at the same time the pressure is so low is not possible, it is likely that the fire was seriously inaccurate. So the ignition timing was checked and found that the camshaft timing mark on the left side of a serious deviation of 5 teeth. After correction, start the engine, the vacuum has increased, at about 35kPa. At this time suddenly found on the crankshaft on the timing mark just aligned with the pulley timing cover on the mark, and this time a cylinder of the piston is stuck in the cylinder from the mouth point 12cm. Then remove the crankshaft timing gear inspection, found that the gear positioning groove damage is very serious, and finally replaced the crankshaft and timing gear, thus completely troubleshooting.