A question of originality
Drums are especially troubling because many are not available anymore. When you turn a drum, you of course make it larger. But the shoes are designed for a specific diameter, so when you use shoes in an oversize drum, not all the lining makes contact, and the center of the shoe has to work harder, which will glaze it and vastly reduce effectiveness. "Back in the day" you could have shoes arced, or in some cases shims intalled between lining and shoe. "Good luck" finding anyone with either capability.
Like this:
Drum Brakes
Arcing machine:
Ends up like this:
Drums are especially troubling because many are not available anymore. When you turn a drum, you of course make it larger. But the shoes are designed for a specific diameter, so when you use shoes in an oversize drum, not all the lining makes contact, and the center of the shoe has to work harder, which will glaze it and vastly reduce effectiveness. "Back in the day" you could have shoes arced, or in some cases shims intalled between lining and shoe. "Good luck" finding anyone with either capability.
Like this:
Drum Brakes
Arcing machine:
Ends up like this:
