Drum brake upgrades are easier than you may think. If you can find a dead Super Beetle, they have bigger front drums that are both wider and larger in dia. The only alteration you need to do is redrill the backing plate's mounting holes to fit the pattern on your standard Beetle. You have to get everything from the Super, most importantly, the wheel cylinders.
The rears can be upgraded too. Find a dead 66-73 Type 3. Again, get everything off the rear of that and install on your Beetle.
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