Recommended Additional Upgrades
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S1 FL 30th Anniversary Special Edition Brake & Clutch Set
Get the Combo set for the ultimate brake system upgrade.
The RCB (Racing Boy) 550mm S-Series Brake Hose is a high-performance, universal braided stainless steel brake line engineered to replace standard expansion-prone rubber hoses. The S-Series is specifically optimized to eliminate brake lever sponginess, maximize fluid pressure delivery, and provide razor-sharp braking response under intense operating conditions.
At a compact 550mm (55cm) length, this universal hose is perfect for rear brake setups on full-sized motorcycles, or front and rear brake configurations on compact sport bikes, underbones, and performance scooters.
Key Features
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Zero-Expansion Braided Core: Constructed with a high-density stainless steel wire braid wrapped around a heavy-duty, low-friction inner Teflon (PTFE) core. This prevents the hose from expanding under hard braking, ensuring 100% of your lever force is transferred directly to the caliper pistons.
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Highly Durable Protective Jacket: Outer-coated with a crystal-clear or colored PVC protective sleeve that safeguards your bike’s paintwork against scratching, while sealing out road grit, water, and debris.
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Precision-Engineered Banjo Fittings: Equipped with premium, corrosion-resistant alloy banjo fittings designed to provide a leak-proof seal and resist stripping under high torque loads.
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Optimal Heat & Pressure Resistance: Built to handle extreme thermal loads and high pressure spikes, preventing brake fade during aggressive track riding, steep descents, or heavy stop-and-go traffic.
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Universal Configuration: Features standard 10mm (M10) banjo eyelets on both ends, allowing seamless compatibility with aftermarket or OEM master cylinders and calipers from major brands like RCB, Brembo, Nissin, and ByBre.
Technical Specifications
| Feature | RCB S-Series Brake Hose Details |
| Series | S-Series High-Performance |
| Hose Length | 550mm (55cm / 21.6 inches) |
| Inner Core Material | Teflon / PTFE |
| Outer Wrap Material | Braided Stainless Steel with PVC Sleeve |
| Banjo Eyelet Size | 10mm (M10 Universal Standard) |
| Position | Universal (Typically Rear Brake or Short Front Setup) |
| In the Box | 1x Braided Brake Hose with basic sealing washers |
Fitment & Application Guidelines
Before purchasing a universal line, it is essential to trace and measure your motorcycle’s existing routing to confirm the 550mm length is ideal:
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Rear Brake Upgrade: The 550mm length is most commonly utilized as a high-performance rear brake line replacement for lightweight sports bikes, naked street fighters, and performance scooters where the master cylinder sits close to the rear caliper.
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Compact Front Setup: Can be used for custom low-handlebar front brake configurations, specific custom café racer projects, or small-displacement scooters requiring a shorter front brake line run.
Installation Guideline
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Banjo Bolt Alignment: Thread the banjo bolts by hand into the master cylinder and caliper to prevent cross-threading. Ensure the angle of the hose eyelets allows a smooth fluid path without twisting the line.
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Fresh Crush Washers: Always use brand new copper or aluminum crush washers (two per banjo bolt: one on each side of the hose fitting) during installation. Reusing old washers frequently leads to microscopic fluid leaks.
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Steering & Suspension Clearance: Once installed, pump the rear suspension or turn the front handlebars fully from lock-to-lock. Verify that the brake line does not get pinched, kinked, stretched tightly, or rub against the exhaust pipe or tires.
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Thorough Bleeding: After securing the line, fill the reservoir with the manufacturer-recommended brake fluid (DOT 3, DOT 4, or DOT 5.1). Bleed the system completely until all air bubbles are eliminated and a firm, solid feel is restored to your lever or foot pedal.
