The Shimano Deore M6100 Rear J-Kit delivers confident, reliable hydraulic stopping power for trail and cross-country riding. This complete, pre-bled rear brake package pairs the BR-M6100 2-piston caliper with the BL-M6100 left lever and a 1700mm hose — everything you need to fit or replace a rear brake in one box.

Highlights

• SERVOWAVE technology: Shorter free stroke and quicker brake engagement give precise, progressive modulation — more control in technical terrain.
• ICE Technologies compatibility: Works with Shimano ICE Technologies rotors and pads for improved heat dissipation and consistent performance on long descents.
• I-SPEC EV lever mount: Shimano's I-SPEC EV interface integrates directly with compatible Deore shifters, reducing clutter on the bar and allowing a 10° rotation adjustment for an ideal position.
• Reach adjust: Lever reach is adjustable with an Allen key, making it easy to dial in finger position for riders of all hand sizes.
• Pre-bled J-Kit convenience: Arrives pre-filled with Shimano mineral oil and sealed — ideal for frames with internal hose routing, and faster to install than a component-only build.
• 2-piston aluminium caliper: Lightweight 2-piece aluminium body with synthetic resin pistons delivers consistent clamping force and a compact profile.
• One-way bleeding system: Shimano's funnel bleeding method makes air purging quick and straightforward for servicing.

Construction

The BR-M6100 caliper uses a 2-piece aluminium body with two synthetic resin pistons and a post mount interface. The BL-M6100 lever is a 2-finger unit machined from aluminium with a split-clamp bar mount and full I-SPEC EV compatibility for integrated shifter mounting. The 1700mm SM-BH90-SS hose is pre-installed and sealed, making this J-Kit particularly well-suited to bikes with internal rear brake routing.

Pad Compatibility

Compatible with Shimano B01S resin pads and J04C metal pads (with fin options available). Works with Shimano ICE Technologies rotors for enhanced thermal management. Rotor sizes compatible: 140mm, 160mm, 180mm, and 203mm (with appropriate adaptor).

Compatibility & Fit

Caliper mount: Post mount (PM). Lever hand: Left (rear brake — Australian standard). Hose: SM-BH90-SS, 1700mm, straight joint. Hydraulic fluid: Shimano mineral oil. Compatible with Deore SL-M6100-I shifters via I-SPEC EV. Recommended rotors: SM-RT54, SM-RT56, SM-RT64, SM-RT66.