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It is not an ABS caliper, it is a linked brake caliper, So using the rear brake operates the one piston on the front caliper. ABS is not in the caliper.
@Chak is talking about the master cylinder not the caliper. There are two types of master cylinder,
Pistons, polish them with scotchbrite pads. When rebuilding make sure the groves the rubbers sit in are free from corrosion and the rubber sits in them correctly. Check that you need the seal as long as the seals are not damaged they can be reused.
EDIT - More pistons doesn't mean better, but that is more about the engineering of how brakes work. In this case sliding pin calipers to calipers with pistons on both sides in an upgrade. But that is a very long conversation.
Also I assume this is an ABS calliper, right?
And the two bolts highlighted are for ABS banjos(?) ?
So does that mean you can blank them off with regular solid bolts and use them as non-ABS single line calipers with a normal banjo going to the attachment at 9 o'clock?
Cheers.
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