I recall people doing this in the early '80's. The benefits were cost, ease of installation and it retained the OEM parking brake. The downside was weight. The bracket that mounts the OEM rear caliper is needlessly heavy. I remember people filling those brackets full of holes in order to reduce the weight. Things got complicated too, if you had larger than stock rotors. Nowadays, it seems like an impractical mod. when you can simply call Scott and buy a pair of 4 piston Wilwood calipers that are better in every way than doubling up on the OEM stuff.
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