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Master Cylinder problem?
Rebuilt all four calipers and single master cylinder on my 1967 Porsche 912. Reassembled everything and could not sustain pressure - pedal went to floor. I could "pump it up" to the point that the brake lights would go on, but I would lose it every time I fully released the pedal. I plugged the left rear caliper, and checked. No change. Then I plugged the right rear, right front, and re-bled the left front. Still no pressure. I figured it had to be the master cylinder so I replaced it. With only the left front caliper (and the brake light switch on the right side of the master cylinder circuit) connected, IT STILL WOULDN'T WORK!
Checked the blog and found what I needed: "MAKE SURE THE BLEEDERS ARE POINTING UP". Uh oh! The rear calipers were fine but the front were wrong - bleed valves were on the bottom. Somehow I had swapped the right and left front calipers when I rebuilt them. Changed them, reconnected the rear calipers, power bled everything, and voila - I have brakes.
The posting was from 2002, but the information was still relevant 21 years later! Thank you Pelican Parts for maintaining the site.
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