Yes, pretty much. Many folks on here have had good luck with 40 long depresses of the brake pedal with the car off. There is also a procedure I followed from the service manual below that worked for me.
BLEED BRAKE BOOSTER W/ACCUMULATOR PUMP
ASSEMBLY
HINT:
Perform this step only if the brake booster with
accumulator pump assembly is removed and/or
installed.
(a) Turn the ignition switch off, depress the brake pedal
20 times or more to release the pressure from the
accumulator.
(b) Fully depress the brake pedal 10 times.
(c) Turn the ignition switch to the ON position and start
the brake booster pump.
(d) Make sure the pump operates for 8 to 14 seconds.
If the pump does not operate as specified, repeat
steps (a) to (c) and recheck the operating time.