Is the servo working ok ? im a petrol head and there are posts on here how to check the servo function of diesels and what to check. Have a google on the search bar. Hope the pistons were nice and free in and out , when you did pads and discs. Sometimes even though they move in and out , they can be lazy when dirt has embedded inside the cylinder. You wont necessarily have brakes pulling to one side , but are just lazy. If the fluid was as dark as you say , when it came out, then there is a big possibility that they need a refurb kit or at least a good clean out.
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