Brembo RCS Front Brake Master Cylinder for Single Disc and 1-Inch Bars, Part 110A89730

The Brembo RCS radial front brake master cylinder delivers adjustable, race-inspired control for motorcycles equipped with a single-disc braking system and 1-inch handlebars. Designed around Brembo’s patented Ratio Click System, the master cylinder allows riders to select between a more direct response and a smoother, more progressive feel. This adjustment helps tailor lever feedback and braking sensitivity to riding conditions, personal preference, and the desired level of control.
The radial design supports efficient force transfer from the lever to the braking system, providing a precise feel through the full range of lever travel. Riders can fine-tune the relationship between lever movement and braking response without replacing the master cylinder, making the RCS a versatile choice for street, touring, and performance-focused applications. Its refined construction and motorsport-derived operating concept make it well suited to riders seeking improved modulation and a more deliberate connection to the front brake.
This Brembo RCS front brake master cylinder is identified by part number 110A89730 and is intended for single-disc applications using 1-inch handlebars. The brake light switch is universal and may require modification for proper installation on Harley-Davidson models. The fluid reservoir and mounting bracket are sold separately, allowing the installation to be configured around the motorcycle’s control layout and available space. Confirm brake-system compatibility, handlebar fitment, switch requirements, and required accessories before installation. Professional installation and proper brake-system bleeding are recommended to help ensure dependable operation and consistent lever performance.

Features:

• Adjustable RCS response: Switch between a stronger, more direct braking feel and a smoother, more progressive response.

• Radial master cylinder design: Provides precise lever feedback and efficient braking-force transfer for improved control.

• Single-disc application: Designed for front brake systems using a single brake disc.

• 1-inch handlebar compatibility: Intended for motorcycles equipped with 1-inch handlebars.

• Universal brake light switch: May require modification for installation on Harley-Davidson models.

• Separate components: Fluid reservoir and mounting bracket are sold separately.