Sharpen your gravel bike's stopping power with this pre-bled Shimano GRX hydraulic disc brake kit. It pairs the lightweight left-side BL-RS717 brake lever with the flat-mount BR-RX410 two-piston calliper for confident, controlled braking on rough back roads and long descents — and arrives ready to fit straight out of the box.

Highlights

• Pre-bled and pre-hosed: arrives fully assembled with a 1700mm SM-BH90 hose, ready for rear installation with minimal workshop time.
• Tool-free Reach Adjust: dial in lever position for your hand size without removing the lever from the bar.
• Resin finned pads (L05A-RF): the finned backplate sheds heat on long descents to reduce fade and keep braking quiet and consistent.
• 10% wider pad clearance: the BR-RX410 calliper is engineered with more pad-to-rotor clearance to reduce drag and brake rub.
• One Way Bleeding: simplified bleeding process with streamlined oil routing makes maintenance cleaner and faster.
• Shimano mineral oil: non-toxic, gentle on frame paint, and safer to handle than DOT fluid alternatives.

Lever — BL-RS717

The GRX BL-RS717 is a dedicated left-side hydraulic brake lever designed for drop-bar gravel setups where shifting is handled separately — ideal when paired with the GRX ST-RX715 Di2 right dual control lever. A raised hood head prevents hand misalignment, a recessed finger notch stops upward slipping, and the ergonomic shape matches the GRX family's refined feel for long-distance comfort.

Calliper — BR-RX410

The BR-RX410 is a flat-mount, two-piston hydraulic calliper designed specifically for gravel use. Enhanced modulation and a quicker initial bite point give you precise speed management on loose, unpredictable surfaces. Shimano's Easy Hose Joint System simplifies hose replacement, and the One Way Bleeding system keeps future servicing clean and straightforward.

Compatibility & Fit

This is the left-hand lever, which in the Australian setup operates the rear brake. The BR-RX410 calliper is flat mount and this kit is configured for a rear frame mount thickness of 25 mm. Supplied with a 1700mm hose suited to rear routing. This kit does not include a disc rotor or mount adapter — order the appropriate rotor and adapter separately to suit your frame and chosen rotor size. Finished in black to match the broader Shimano GRX gravel component range.