Brembo 15RCS Radial Brake Master Cylinder 1″ for Harley-Davidson
Upgrade your Harley-Davidson’s braking performance with the Brembo 15RCS Radial Brake Master Cylinder, engineered to deliver exceptional braking power, improved modulation, and superior rider confidence. Featuring Brembo’s patented RCS (Ratio Click System) technology, the 15RCS allows riders to fine-tune braking characteristics for maximum comfort and control on both the street and spirited rides.
Manufactured from forged aluminum alloy with precision CNC-machined components, the Brembo 15RCS combines lightweight construction, exceptional durability, and race-proven engineering.
Key Features
-Brembo RCS (Ratio Click System)
18 mm Ratio – Smooth, progressive braking with enhanced modulation.
20 mm Ratio – Firmer lever feel with faster, more responsive braking.
The lever ratio can be adjusted quickly using a standard screwdriver.
-15 mm Radial Master Cylinder
The 15 mm piston diameter is optimized for single-disc Harley-Davidson braking systems, delivering consistent hydraulic pressure and excellent braking feel.
-Premium Brembo Engineering
* Forged aluminum alloy body
* CNC-machined components
* Hard-anodized finish
* Lightweight radial master cylinder design
-Folding Brake Lever
Standard-length folding lever designed to reduce damage in the event of a tip-over.
-Integrated Brake Light Microswitch
Includes a mechanical brake light microswitch for straightforward installation.
-DOT 4 Brake Fluid Compatible
Designed exclusively for DOT 4 brake fluid.
Ideal Applications
Ideal for:
* Harley-Davidson Softail
* Harley-Davidson Dyna
* Harley-Davidson Sportster
* Harley-Davidson Custom Builds
* Single-disc Harley-Davidson models
Always verify compatibility before installation.
Why Choose the Brembo 15RCS?
The Brembo 15RCS delivers race-inspired braking performance with improved modulation, superior stopping power, and outstanding rider confidence, making it one of the best brake upgrades for Harley-Davidson motorcycles.




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