I used the Wilwood Kart brakes when I upgraded my brakes to Wilwood units as I wanted to keep the outboard weight down. I had to fab a mounting bracket and add spacers and longer bolts (available from Wilwood) to the kart brake to accommodate the wider, vented, 1 ΒΌ inch Wilwood rotor. So far they work great and I live in the hills so I use them frequently. You could get more mechanical advantage if you needed it by fabricating a simple lever arm under the car. I had to do that on my Cobra kit car.
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