Easiest way I know of to test if the rear adjustments are the issue is to turn the car on and have somebody with a pair of pliers clamp the soft line at the bock before the brake line T.
If the pedal is soft/squishy without the line clamped and it becomes high and hard after it's clamped. You know you have an adjustment issue, air in the lines or a leak issue after that T. most of the time it'll either be adjustment, trapped air or a combination of both.
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-Jason
1969 Pontiac Firebird
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