Brembo RCS Front Brake Master Cylinder for Dual Disc, 1-Inch Handlebars - 110A89710

The Brembo RCS front brake master cylinder delivers race-inspired braking control for motorcycles equipped with dual-disc front brake systems and 1-inch handlebars. Designed for riders who want more precise lever response and improved braking feedback, this radial master cylinder uses Brembo’s patented Ratio Click System (RCS) to adjust the relationship between lever movement and hydraulic response. Part number 110A89710 provides a practical way to tailor braking feel for street riding, spirited use, or track-focused applications.

The adjustable RCS mechanism lets riders select between a stronger, more direct response and a smoother, more progressive feel. This flexibility helps accommodate different riding styles, tire characteristics, braking conditions, and personal preferences. The radial design supports efficient force transfer at the lever, giving the rider refined control and consistent modulation throughout the braking range. Its dual-disc configuration is intended for applications requiring appropriate hydraulic capacity for twin front brake calipers.

Installation and final setup should be performed by a qualified technician familiar with motorcycle braking systems. The brake light switch is universal and may require modification to work with Harley-Davidson models. The fluid reservoir and mounting bracket are sold separately, so verify the required components and handlebar compatibility before installation. As with any brake system upgrade, confirm master-cylinder, caliper, rotor, and line compatibility, then bleed the system thoroughly and check for proper lever operation before riding. The Brembo RCS master cylinder combines adjustable response, dependable construction, and rider-focused feedback in a compact upgrade for performance-oriented braking control.

Features:

• RCS adjustable ratio system allows selection between direct, high-response braking and smoother, more progressive lever feel

• Radial master-cylinder design improves braking precision, modulation, and lever feedback

• Configured for dual-disc front brake systems and 1-inch handlebars

• Universal brake light switch may require modification for Harley-Davidson applications

• Fluid reservoir and mounting bracket are sold separately

• Brembo part number 110A89710