Brembo 14 RCS Radial Brake Master Cylinder – Single Disc, 2-Piston Caliper Applications

The Brembo 14 RCS Radial Brake Master Cylinder brings MotoGP and World Superbike-spec braking technology to street riders on single disc systems. Featuring Brembo's patented RCS (Ratio Click System), this 14mm floating piston master cylinder lets you switch between two distinct lever ratio settings in seconds — no tools required beyond a screwdriver — to match your riding style, conditions, and personal preference.

Designed for single disc braking systems with 2-piston fixed or floating calipers, the 14 RCS is also compatible with popular scooters using single disc setups. With forged aluminum construction, ultra-hard anodized finish, and the same piston assembly found in factory race bikes, it's a direct upgrade over any stock master cylinder.

RCS Ratio Settings

• 14×18mm: More gradual braking with longer lever stroke — ideal for wet conditions or trail braking
• 14×20mm: Classic road riding feel with firmer initial bite
• Switch between settings in seconds by rotating the cam roller on the lever clevis 180° — red marking = 18mm, black marking = 20mm

Specifications

• Piston Diameter: 14mm (floating)
• Lever Ratio Settings: 14×18 or 14×20 (adjustable)
• Body: Forged aluminum alloy, CNC machined, hard anodized (ultra-hard oxide) finish
• Piston Assembly: MotoGP/WSB-spec piston, seals, and push rod
• Lever: Forged aluminum, hinged with patent crash-protection angular movement system
• Compatible Systems: Single disc with 2-piston fixed or floating calipers (scooter compatible)
• Fitment Note: Designed for “Underbone” / single disc applications — not for twin disc setups
• Brembo Part #: 110.A263.45

In the Box

• Brembo 14 RCS Radial Master Cylinder
• Forged folding lever (installed)
• Normally Closed (N/C) brake light microswitch
• Special connection fitting for hydraulic hose

Notes

• Verify your brake light circuit is compatible with a Normally Closed (N/C) microswitch before ordering
• Not sure if the 14 RCS is right for your application? Contact us before purchasing
• Spare and replacement Brembo parts are available separately