Recommended Additional Upgrades
The RCB S1-FL (Forged Luxury/Folding) is the top-tier evolution of the S1 series, combining high-performance radial technology with “luxury” design refinements. If the E-series is about street reliability, the S1-FL is about racing precision and cockpit aesthetics.
Here is everything you need to know about the S1-FL:
Key “FL” Upgrades
The “FL” stands for several premium features that distinguish it from the standard S1:
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Longer Lever: The lever is roughly 1.3cm longer than the previous S1 model, providing better leverage and a more comfortable pull for two or four-finger braking.
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Forged Body: Unlike cast master pumps, the S1-FL is forged, making it much stronger, denser, and more resistant to high hydraulic pressure without flexing.
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Folding (Collapsible) Lever: A critical safety feature—the lever is designed to fold upward (90 degrees) during a fall or tip-over, preventing the lever from snapping and protecting the master cylinder body.
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Diamond-Cut Logo: Features a high-contrast, embossed RCB logo for a premium visual finish.
Radial vs. Axial (The Performance Edge)
Unlike the E2 or E3 series (which are Axial pumps), the S1-FL is a Radial master cylinder.
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Direct Feel: In a radial setup, the force from your hand is pushed directly in line with the piston. This eliminates “lever flex” and gives you a much more communicative feel of exactly how much brake pad is touching the disc.
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Modulation: It is much easier to “trail brake” (slowly releasing the brake while entering a corner) with the S1-FL compared to the E-series.
Which size should you choose?
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14mm: Best for underbones and sports bikes (like the Yamaha R15 or Suzuki GSX-R150) using the stock caliper or a 2-pot caliper.
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17mm: Necessary if you have upgraded to a large 4-pot caliper (like Brembo or RCB’s own S-Series calipers) or if you are running a twin-disc setup.
The Verdict
The S1-FL is the ultimate choice if you want the “big bike” feel on a small-to-mid displacement motorcycle. It offers the best balance of safety (folding lever), durability (forged alloy), and professional-grade braking feedback.
Note: Because it uses a separate reservoir tank, you will need a mounting bracket (usually included) to clear your fairings or mirrors, unlike the integrated tanks on the E-series.
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Racing Mod is the Official Flagship Store for RCB Bangladesh and Uma Racing Bangladesh.
All our products are 100% authentic and come with an official authentication QR code for verification.
Common Questions & Answers (FAQs)
Is this master cylinder compatible with my motorcycle?
Yes, this master cylinder offers universal fitment and works with most motorcycles, especially 150cc to 350cc bikes with hydraulic brake systems.
Do I have to buy RCB brake hose with this?
Most customers buy the RCB brake hose when they buy the RCB S1 FL Master Brake Pump for better braking performance upgrade, but it is not like you have to buy the brake hose with the master cylinder.
What makes a 14mm master cylinder better?
A 14mm master cylinder provides a balanced braking feel. It gives better control without making the brake too hard or too soft.
Is this master cylinder suitable for daily use?
Yes, it is ideal for daily riding as well as performance use. It improves safety and rider confidence.
Does this include a brake lever?
Yes, it comes with an adjustable brake lever for better comfort and control.
Do I need professional installation?
Installation is simple, but professional installation is recommended for the best performance and safety.
How do I verify the authenticity?
You can scan the authentication QR code included with the product to confirm it is genuine.
