All BRP calipers are machined from billet aluminum, the housings are low profile, but strong allowing less flex and better brake feel.
They have internal crossovers for less chance of leaking
REPLACEMENT PARTS
Piston (each) - BRC230-7531
Piston O-Rings (4 pack) - BRC225-2655
Crossover O-Rings (4 pack) - BRC225-2583
Bleeder screws (4pack) - BRC220-0064
Replacement bridge bolt - BRC190-4090
Pad wear plate (each) - BRC300-5876
Replacement bolt (each) - BOL0062252H