“Monoblock,” sometimes spelled as “monobloc,” refers to the brake calipers being made from one (mono) piece of metal (block). Here we are talking about conventional, multi-piston calipers that have pistons in both sides of the caliper, not sliding-pin calipers that have pistons in only one side. The easiest (and cheapest) way to manufacture such a caliper is to make it in two halves, as the piston bores and the fluid passageways can be machined from the open face. On a conventional, multi-piston caliper you can typically see the seam down the middle and the heads of the bolts holding the caliper together. Again, anything that increases strength and rigidity in the braking system improves feel at the lever, and Brembo was the first company to devise a proprietary process and tooling that allows the bores to be machined even if the caliper is cast or machined as one piece. Other manufacturers have found ways around this tricky part; Honda, for example, bores through the rear of the caliper and welds a plug in place afterward, while Yamaha does the same but uses screw-in plugs.