Brake Bleeding Anomaly on my 66

[theastronaut]

I don't follow, unless you're saying that the amount of booster assist isn't linear compared to pedal input. Both examples have 100 pounds of pedal effort as the input with basically the exact same line pressure as the output- 1197 vs 1166, less than 3% difference.

Unless booster input to output isn't linear, the input to output ratio should stay the same between both examples. If booster output isn't linear to input, that's another reason to not have boosted brakes- the input to output should be linear for more predictable response and ease of modulation near lockup.