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Hello, my name is***** you for the question. Most of the time this is caused by a bad pump. I have changed a lot of these. I would start by making sure that the belt is in good shape and is tight. If it is fine then I start by flushing out the fluid in the system as it can clog it and cause this. If that does not help then most of the time I will replace the pump after pressure testing it. I hope this helps. Let me know if you need further assistance.