1966 Barracuda factory power brakes

IF (and I’m saying if) the booster is truly bad, I’m sure Booster Dewey will stand behind his work and repair it at no charge. I’d give him a call and explain what’s going on and mention another shop’s comment about the booster. Other thoughts - Is the storage tank functioning properly? How about the check valve on the booster itself? If it’s not doing it’s job the booster can’t do it’s job. If the brakes are dragging, that might be a separate issue (adjustment) from the booster. Let us know what you find out. You might also contact Ulf @65dartcharger as he has the same working system on at least 2 or 3 of his 65 Darts. He should be able to provide some insight as well. BTW Nice looking Barracuda!