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I just went through the same thing on my '71 Vista Cruiser, it was a bad "new" master cylinder like Dapapadon said. You did bench bleed the master cylinder and the booster pushrod is the right length?, shouldn't push the MC piston in when mounted or the brakes will never work right, just touching is usually about right. One weird thing is I went to the brake bleeding procedures in the '71 Olds chassis service manual and it said to bleed the brakes in exact reverse order as commonly done, left front - right front- left rear- right rear. I used my Mity-Vac (great tool to have for lots of things) and did it by myself according to the manual and they work fine now, car stops good as they ever did (they don't brake like new cars), and the brake warning light went out after a few pumps.
Allan
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