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I have a challenger with power disc. The last time I drove it I noticed the pedal felt a little different as it seemed to have more travel to get the car to come to a stop. I then tried to slam on the brakes to see if the brakes would lock up, but they didn't, the car slowed to a stop, but not as fast as it used to. I checked the fluid in the MC and both resevoirs were full, but the front resevoir fluid was a milky tan color. I know there are no leaks. I was thinking at first the vacuum hose might have a leak, but the discolored fluid has me puzzled. Is the MC bad? How do you know or check to see if your MC isn't working?

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Start by removing the fluid in the MC and refill it with fresh and procede to flush out the old fluid. It'll take 2 people just like bleeding brakes unless you have access to a pressure bleeder which would speed up the job. The milky fluid has water in it and will give you a spongy brake petal along with causing corrosion and leaks.