Bad booster?

Tooljunkie said
The simple test. Cut and dried.
Exhaust booster by cycling pedal a few times. With foot on brake pedal start car. If pedal drops,say an inch for example then booster is good.

Yeah did the pedal test and didn’t drop. Sent it off to Dewey boosters in Oregon to rebuild because for some reason Dart boosters went extinct. LoL