[rotorwrench]

You never know how well modern replacement parts are going to work. Another problem is how well do the shoes fit the drums and were they properly centered. Back in the day, brake shops had shoe arcing machines so as to get a perfect fit with shoes and drums. With that and proper shoe to drum distance dimensions from careful adjustments could get the brakes to work well enough. They could be locked up with one foot on the pedal in most cases. They didn't need proportioning valves since they had larger diameter brake cylinders on the front than the rear so as to give them the best braking action where it was required. With disks a person needs a proportioning valve set up.