The Shimano Tiagra BR-RS405 brings Shimano's proven road hydraulic braking down to a price that suits everyday road and gravel riders. This is the rear flat-mount caliper, delivering smooth, progressive stopping power with the light lever effort hydraulics are known for, whatever the weather throws at you.

Highlights

• Hydraulic flat-mount caliper for confident, all-weather road and gravel braking
• Two-piston design gives even pad wear and consistent, controllable power
• Runs Shimano L02A resin pads with cooling fins for better heat management on long descents
• One-way bleed system makes setup and servicing quick and clean
• Mineral oil hydraulics for reliable, low-maintenance performance
• Supports both 140 mm and 160 mm rotors via the supplied mounting hardware

Smooth, controlled hydraulic power

The two-piston caliper applies even pressure across the pads, so braking is progressive and easy to modulate rather than grabby. It is a noticeable step up from cable-actuated discs, with less hand fatigue on long rides and dependable bite in the wet.

Heat managed for the long haul

Shimano's L02A resin pads come with cooling fins that draw heat away from the braking surface. That keeps performance consistent on extended descents and reduces the risk of fade.

Easy to live with

A one-way bleed feature streamlines setup and routine maintenance, and the system runs on Shimano mineral oil. This is the rear caliper only, supplied without rotor or adapter.

Compatibility & fit

Flat-mount frame fitting (rear). Works with 140 mm rotors directly and 160 mm rotors using the supplied mounting plate. Uses Shimano mineral oil and is designed to pair with Shimano road hydraulic levers (such as the Tiagra ST-4720 / ST-4725 and compatible BL/ST hydraulic units). In the Australian setup, the left lever operates the rear brake. Brake pads: Shimano L02A resin with fins.