Faith, if your Buick drums don't stop you, something is wrong with the system. I have always used these with no booster, and they stop on a dime. One day my then-wife was following me in her new car, and the light changed, so I came to a stop instantly. She had ABS discs all the way around and almost climbed the trunk of my '27.

I would check bore size on the master cylinder and also that your brakes are adjusted right. If you are using early Ford backing plates, etc (as I am) they are a little tough to get adjusted properly (ask Brian).

They really can stop a lightweight car well if set up properly.

Don