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2001 GMC Sierra Brake issues


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Greetings All! Hopefully someone can help me. Here goes it;  Started with a sinking brake pedal. So far I've replaced the master cylinder, brake booster, ABS unit, calipers and pads all around, new brake lines. Have bled the system at least 5 times, always the same with the truck running. The pedal goes straight to the floor and with engine off it's a little hard, but still sinks. Help me I've run out of ideas. Also I bought a scan tool and auto-bled the ABS. HELP!

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