Which Brembo Master Cylinder Is Right for Your Bike?

RCS19 vs RCS17 vs RCS15 – Explained Simply

Upgrading your brake master cylinder is one of the most effective ways to improve braking feel and performance. But with multiple Brembo RCS models available — RCS19, RCS17, and RCS15 — how do you know which one fits your bike and riding style?

Let’s break it down clearly so you can choose with confidence.

🔧 What Is the Brembo RCS Series?

RCS stands for Ratio Click System — a feature that lets you adjust the lever ratio (18/20) with a simple dial. All RCS models allow this, but the main difference lies in the piston diameter, which affects braking power and feel:

• 19mm – Strongest

• 17mm – Balanced

• 15mm – Smoothest

🥇 RCS19 – The Most Popular Option

💡 Best for:

• Dual-disc setups with 4-piston calipers

• Sportbikes like Yamaha R1, S1000RR, ZX-10R, GSX-R1000

• Riders who want strong, direct braking

• Track and high-speed performance

🔍 Why choose RCS19?

• More braking force from a 19mm piston

• Ideal for large calipers like Brembo M50, Stylema, or GP4-RR

• Excellent performance in high-speed and heavy braking conditions

• Adjustable for race or street feel via 18/20 ratio

🟢 If you're riding a superbike or doing track days — RCS19 is for you.

⚖️ RCS17 – The Balanced Performer

💡 Best for:

• High-performance calipers with smaller pistons

• Lightweight race bikes or custom builds

• Riders who want a mix of power and control

🔍 Why choose RCS17?

• Slightly smaller piston = better modulation and lever feel

• Less aggressive than RCS19, more precise in certain setups

• Also features the adjustable RCS system

🟡 Great for riders who feel RCS19 is too aggressive.

🏁 RCS15 – For Lightweight or Supermoto Setups

💡 Best for:

• Single-disc front brake systems

• Supermoto, lightweight street or track bikes

• Urban riders and fine control situations

🔍 Why choose RCS15?

• 15mm piston gives smoother braking response

• Prevents front lock-up on bikes with less braking demand

• Ideal for supermoto, small capacity race bikes, or daily riders

🔵 If you value precision and ride a smaller or lighter machine — RCS15 is the way to go.

📊 Quick Comparison Table

🛠️ Choosing the Right RCS for You

When choosing your RCS master cylinder, consider:

• Your bike’s weight

• The type of caliper you use

• Your riding style (track, street, stunt, touring...)

More power isn’t always better — balance and modulation matter just as much.

🔧 Need Help Deciding?

At MP Racing NZ, we specialize in high-end brake systems and only supply 100% genuine Brembo products.

👉 Contact us for expert advice or check out the full Brembo RCS collection here.