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Why didn't replacing my master cylinder fix my brake problem?

I have a 2000 gmc serria. When pressed, the peddle goes almost to the floor with very little resistance but just before it hits the floor it gets hard and a murmuring sound comes from under the hood until the pedal is released. I replaced the master cylinder (I'm sure I did it right) and absoulutely nothing changed! What the heck?


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galleryofgrace says

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8 months ago
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