difference between monoblock and twin block calipers

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Monoblock = Machined from a single piece of forged aluminum. Much stronger, and less prone to caliper twisting during load. Higher cost due to difficult machining.

Twin-block = Joint together (front and back) by two pieces, easily spotted with the bolts on front face, top and bottom of the caliper (usually 3 sets each). More prone to twisting. Lower cost than mono-block type.
 
BremboHP-M4CastMonoblockCalipers.jpg

Mono Block

nengun-1305-02-spoon-twin-block_caliper_set.jpg

Twin Block
 
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