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T77911S said it: bad MC You likely need a new master cylinder. You said you pushed the pedal to the floor. That took the piston past its previous length of travel to the unswept area of the master cylinder where resides the corrosion that has accumulated over the years. This cuts the piston seal and then it leaks within the master cylinder when you apply foot pressure allowing brake fluid to pass.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods.
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