Brake squeak AFAIK has no relation to brake fluid. It is a result of the brake pad contacting the brake rotor - i.e. braking. It is an annoyance, but not a sign of anything wrong with your system.

Different brake pad/rotor combinations have different levels/combinations of squeak and dust. Some pads claim to be dustless, others claim to minimize squeak. Dust & squeak are both normal, but bot annoying.

How long ago did you replace your pads? Give them some time to wear down the pad a bit, the squeak may go away. If it doesn't and you want to get rid of the squeak, look into different pads.

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• 2008 X5 3.0si Alpine White