Cat 950F strange brake noise

Hi all. We have some issues with our wheel loader, CAT 950F Series II. From what I can tell they are hydraulic over hydraulic brakes. Serial number is 8TK01037. There is a strange noise coming from around the accumulator charge valve. It started happening immediately after we replaced the orange hose (was originally a steel line), it connects the accumulator charging valve to the pressure reducing valve. Back then it

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