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Check the hydraulic lifts Jinan pull brake contactor is normal, there are contacts adhesions will decline, brake pads have a problem, then not only rise to decline, down the same decline.
2、如果济南液压升降机接触器没问题，再看刹车片上有个凹槽，磨平了才用更换，前提是刹车片没有损坏，比如开裂。
If hydraulic lifts Jinan contactor no problem, look there are grooves, polished it with the replacement of brake pads, brake pads premise is not damaged, such as cracking.
If it is, then lift frequency, after declining to see Jinan hydraulic lift drive has no fault code, if there is consult the factory, the reality may SE fault, meaning the timing error feedback control brake contactor closed properly.