I don't understand why this has to be debated here, and we've been thru this before. "Back in my day, we just used a c-clamp or Channellocks. We didn't need no fancy tools."
First: this is a tool forum.
Second: cars have been sold with four piston (two on each side) painted/powder coated Brembo, and other, calipers for decades now, including non-exotics like Subaru STi. Six piston calipers aren't uncommon on modern performance cars. Are you not aware that painted, or powder coated, 4-6 piston calipers exist?
And yes, I learned in the 1980s also with a c-clamp. But vehicles evolve and times change. I will spend the $20 for the correct tool to touch only the pistons, or pads, and not my $500+ painted Brembo caliper. I doubt anyone working at a dealership isn't using the correct caliper tools because they'd be fired after their first pad change if they F'd up someone's painted calipers.
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