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brake pedal goes to floor after starting car.

Brakes

Model: 911, Year:87, Mileage:72k, Type of use:Both Street & Track
Hi, The last time I drove the car the brakes were fine. I bled the brakes for an up coming DE like I have done many times. I use ATE Blue fluid, (for the past 5 years) and the calipers have been rebuilt in the last 3 years. The brake hoses are stainless braided(about 3years old). I believe the master to be oe with 72K miles. After bleeding the brakes the pedal had a firm feel. The car was started and the pedal went to the floor. I rebled the brakes and had the same result. Is this a symptom of a master cyl leaking internally? What are the troubleshooing steps to confirm the master is serviceable or in need of replacement.

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