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Hello I will help you with your question,
The front brakes are always dragging or is it OK then while you drive they apply by themselves?
If you open the bleeder at the wheel does the brake release? How about if you crack the line open at the master cylinder?
Do you have vacuum to the booster?
You say the calipers were replaced, were the slider pins in the caliper bracket that the caliper bolts to free to move?
The hydraulic system is the same as other car lines, nothing specific here but normal testing.
If the brakes are applied all the time is the pushrod length on the booster correct? The rod should not be pressing on the piston with the engine running and your foot off the pedal. Other possibility is the booster is being pulled forward by a poor seal on the back half which would apply the brake.
No trick here but trying to isolate the source of the problem, check the pushrod (brakes release if you remove the nuts on the master to booster) and see if the booster is leaking at the rear seal.
OK, I don't know what you are seeing, these are things I would be checking. 1/4 inch is way too much, how come it is so short?
OK, that is better, do you know how to do the booster check?
New means Never Ever Worked so unless it tests as good I would not count on new as being good.
Was the brake pedal pushrod adjusted to 5.72 inches center of clevis to face of booster against firewall?
Let me know what you are seeing