68 Barracuda power drum brakes,peddle hard.

This can be all over the place. Start engine to get vacuum, then shut off. Now push pedal several times; if the pedal raises, compared to engine running- booster. What size bore is the M/C? It seems backward, but a bigger bore means more pressure to stop.



If the booster is working, after you shut off the engine, you should immediately tell the difference in pedal after one or two footstrokes

Also, there is a HUGE bunch 'o stuff that can detract drum brakes. If someone turned the drums a little too large, the shoes will only contact the center area of the braking surface, meaning only a part of the shoes are doing the work. This makes them overheat, glaze and you need more pedal to stop

Shoes come in a few different "quality" so pedal pressure and evident braking can be very different between shoe types.

Someone may have switched the primary / secondary shoes front to rear, which will affect braking.

And, of course, drums are affected simply by how large they are. In this day and age, we've become used to lighter cars with disk--and four wheel disk brakes. Many of these old girls never were stellar in the braking dept.