Hi guys, i'm having a recurring issue with our hyundai hl960A wheel loader. the priority valve for the brake and fan keeps malfunctioning. the brake pressure gets low and it puts on the parking brake. but the fan is roaring. so it can't be the pump when i replace it all goes back to normal, for about 2 months. then same problem. the machine has about 4500 hours, ad has recetly received a full service. any idea what can cause the priority valve to keep breaking?
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