Keep the whole brake together.

The archived Shimano parts drawing identifies RT-MT800 with BR-M8120 and records the hose, pads and fittings. Keep this established generation distinct from newer XT brakes and their service requirements.

The rotor example needs a CENTER LOCK hub and a suitable lockring. It does not fit the six-bolt wheel example directly. Select the corresponding hub version or revisit the rotor through Shimano’s compatibility chart.

This recipe identifies A1 deliberately; Maven Silver B1 also exists. Identify the model before choosing service parts. The product/service listing includes organic and sintered pad options; confirm the pads in the package you order.

The six-bolt HS2 connects to the six-bolt Pro 5 wheel route. Its 200 mm diameter requires the appropriate frame/fork mount and adapter. It does not use the same adapter assumption as the 203 mm Hope rotor example.

• Hub attachmentSix-bolt or CENTER LOCK; include the correct bolts or lockring and tool.
• DiameterConfirm frame and fork permitted sizes separately. Record the native mount size before selecting an adapter.
• Thickness and pad compatibilityUse the brake maker’s documented rotor and pad combinations. A thicker rotor is not an automatic upgrade.
• ClearanceCheck caliper alignment and clearance around the carrier, fasteners and frame/fork.

No adapter part number is selected here because the frame and fork are not identified. A post-mount brake also needs a different assessment from a flat-mount installation.

BL-M8100 uses I-SPEC EV for compatible integrated controls. The existing XT drivetrain recipe selects a separate-clamp SL-M8100-R; it does not require converting to an integrated shifter. If using the integrated version, check its exact mounting specification.

For Maven, choose the appropriate standalone or MatchMaker X clamp arrangement for the actual shifter or AXS controller. Check reach and handlebar space with the dropper remote in place. A third-party adapter needs its own model-specific fit evidence.

The drivetrain brand does not determine the brake brand. Hydraulic lever/caliper mixing is a separate compatibility question and is not approved by a matching handlebar clamp.

For each end of the bike, record lever side, hose routing and length, caliper, pads, rotor diameter and attachment, adapter, mounting hardware and required fluid. Then add the correct bleed block, fluid-specific kit, hose tools, rotor tool and torque tools from the model’s manual.

Keep the two fluid systems and their service equipment identified. Do not choose fluid by the words “mineral oil” alone, substitute DOT fluid, or assume Shimano low-viscosity oil belongs in this older XT recipe. Follow the exact model instructions for fittings, hose shortening, bleeding and pad bedding.

A front-and-rear set is two separate circuits. Front and rear rotor sizes, hose lengths and adapters may differ. Final installation includes a leak check, lever-function check, secure mounting and the manufacturer’s bedding procedure before riding.