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Hey, what size is the pistons on those AMG calipers? Tim

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They're VERY small.

...but there's also 8 of them

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Hey, I may be only an inch long but I am built like a Tuna Can....

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It's like a cheese wheel.





The front calipers have 28 and 32 mm pistons. That's 1.1" and 1.25" each. There are 4 brake pads per caliper. Leading outside, trailing outside, leading inside, trailing outside. Each pad has a small leading piston and large trailing piston.
Think of them as two small calipers joined together.

The rears are 28/30 mm pistons. 1.1" and 1.18" each. They are conventional 4 piston calipers.