Originally Posted by slomofo

Is the brake pedal hard as a rock? If no, the booster is fine; forget everything else everyone is saying about the booster, it's fine.

Did you bleed in the proper sequence? Left Rear, Right Front, Right Rear, Left Front is the sequence to bleed.

Do you have rear drum brakes? If so, are they adjusted properly? If no, fix problem, if yes, don't worry about them.

Are there any visible leaks at your rear calipers or wheel cylinders and your front calipers?

Do you have a dial indicator? If so, check for wheel bearing play at all four wheels. If not, check for play anyway and use common sense to determine if they're good or not.

If all else has been completed and problem still persists, remove the master cylinder and inspect for visible leaks at rear of master. Are any leaks present? If no, bench bleed master and reinstall.

If all else has been completed, have somebody else pump the brakes until it pressure is good while you proceed to follow every individual brake line looking for a kink or small puncture.

If all tasks have been performed and problem still persists, then you've done something wrong and need to have a professional look at it.