If you suspect a dragging brake

With alloy wheels, carefully feel the center of each wheel - a dragging one will be hot, possibly hot enough to burn you.

For steel wheels, remove the hubcaps and do the same.

A different booster may have some different dimensions that could cause all the brakes to drag.

I don.t know about your car but in a 544, when the brakes are released a certain part of the master cylinder must line up with a bleed hole to the fluid reservoir - if the brake push rod is too long or not properly adjusted, pressure remains in the system and the brakes will drag as the fluid heats up.

In the repair manual one takes a paper clip or similar item to stick down the bleed hole and it must go down the hole a certain dimension or the master cylinder is not set up right.

See if your garage knows if this applies to your car.

I have a booster in my 54 Chevy and it needs to be replaced - instead of a bleed hole, the master cylinder has two relief valves that hold something like 4 and 6 psi on the lines when the brake pedal is released. My mechanic advised me to install new check valves as a precaution.