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Hi from my experience sounds like the master cylinder might be going out. If you have covered the basics making sure that the system has been bled and has fluid and is not leaking fluid anywhere. The good test is to pump the brake pedal 5 or 6 times and hold pressure on the paddle with your foot for sometimes up to you 60 seconds or so you will feel the pedals start to go down on a sudden that would be a bad master cylinder. It's good to Paris on the paddle pretty hard sometimes longer in 60 seconds maybe a couple of minutes this is a good field test good luck
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