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故障现象一辆斯太尔6×4自卸车,当驻车制动手柄置于行驶位置时,听到驾驶室前部有大量漏气声,驻车无法解除,经检查发现制动总阀的排气口持续排气;当驻车制动手柄置于驻车位置时,该处不排气。故障诊断更换制动总阀后试车,故障依旧。询问驾驶人得知该车一个月前更换行车制动继动阀后,制动迟滞明显,制动距离延长(重载时尤为明显),制动回位慢。由于驾驶人反映的问题是在更换行车制动继动阀后出现的,显然更换后的行车制动继动阀出故障的可能性较大。于是更换行车制动继动阀,但故障依旧,笔者对该故障的诊断陷入困境。根据以往的经验,解除驻车时制动总阀的排气口持续排
Symptom A Steyr 6 × 4 dump truck, parking brake handle placed in the driving position, I heard a large number of front of the cab leak sound, the parking can not be lifted, the inspection found that the main brake valve Exhaust port continues to exhaust; when the parking brake handle is placed in the parking position, the place does not exhaust. Troubleshooting After replacing the brake master valve test, the fault still. Asked the driver that the car a month ago to replace the service brake relay valve, the brake hysteresis significantly longer braking distance (especially heavy load), brake back to slow. Since the problem reflected by the driver appears after the replacement of the service brake relay valve, it is clear that the replacement service brake relay valve is more likely to fail. So replace the service brake relay valve, but the fault remains the same, I troubled the diagnosis of the fault. Based on past experience, lifting the parking brake total valve exhaust row continued row