RCB E2 SERIES BRAKING SYSTEM
RCB S1 SERIES BRAKING SYSTEM
Recommended Additional Upgrades
RCB A3 Brake Fluid Tank (Universal) is a high-quality, universal external reservoir upgrade designed for motorcycles equipped with radial or external-reservoir master cylinders.
Part of RCB’s sleek and reliable A3 Series, this reservoir replaces vulnerable, yellowed, or boring factory plastic tanks with an impact-resistant, beautifully finished housing that sharpens the look of your motorcycle’s cockpit while maintaining strict hydraulic reliability.
Key Features
Premium Impact-Resistant Engineering: Fabricated from high-grade industrial polymers or reinforced acrylics, the A3 tank is engineered to withstand extreme vibrations, harsh ultraviolet (UV) sunlight exposure, and direct contact with corrosive hydraulic brake fluids without cracking, leaking, or clouding up over time.
Crystal-Clear Fluid Viewability: Outfitted with a premium smoke or transparent finish. This allows riders to instantly check their brake fluid level and check for fluid contamination (darkening) at a glance without having to unscrew the cap.
Leak-Proof Sealed Cap System: Equipped with a precision-threaded top cap and a heavy-duty, chemical-resistant internal rubber diaphragm/gasket. This creates an airtight and weatherproof seal, preventing external moisture from creeping in and contaminating your brake fluid.
True Universal Application: Built to work seamlessly on almost any motorcycle brand (Yamaha, Honda, Suzuki, Kawasaki, Ducati, etc.). It hooks up effortlessly to RCB master cylinders (such as the S1, E4, or S3 series) as well as any aftermarket or OEM master cylinder setups requiring an external fluid tank.
Vibration-Dampening Bracket: Includes a heavy-duty metal mounting bracket that isolates the fluid tank from high-RPM engine harmonics and chassis vibration, preventing the fluid from foaming or aerating inside the reservoir.
Technical Specifications
| Feature | RCB A3 Brake Fluid Tank Details |
| Series | A3 Control Accessories |
| Tank Body Material | High-Density, Chemical-Resistant Acrylic Polymer |
| Bracket/Hardware | High-Tensile Steel / Alloy Bracket Mount |
| Outlet Spigot Size | Standard Diameter for Universal Brake Hose Routing |
| Compatibility | Universal Fitment (Front Brake or Rear Brake Master Cylinders) |
| Fluid Support | DOT 3, DOT 4, and DOT 5.1 |
Performance Upgrade
Standard OEM external brake fluid reservoirs are often bulky, plain, and prone to turning an ugly yellow color after a few seasons out in the sun. The RCB A3 Fluid Tank shrinks down the visual profile on your bars into a clean, race-inspired design. Its compact size makes it highly popular for naked sport streetfighters, track sportbikes, and custom cafe racers where clean cockpit lines are essential.
Installation Guidelines
Keep the Reservoir Level: When mounting the metal bracket to your master cylinder or handlebar riser, ensure the tank sits as level as possible. If the reservoir tilts too sharply at an angle, it could accidentally allow air into the master cylinder when your fluid level starts running lower.
Avoid Fluid Spills: Brake fluid is highly corrosive and will instantly strip or ruin your motorcycle’s paint, plastics, or fairings if spilled. Always lay down protective rags or microfiber cloths around your handlebars before transferring fluid into the new A3 tank.
Secure the Feed Hose: Slide the brake fluid hose fully onto the bottom spigot of the A3 reservoir and use a secure spring clamp or hose clip. A tight fit ensures no air can seep into the line and prevents slow, dangerous fluid weeping.
Complete System Bleed Required: Whenever you disconnect a fluid line to install a new reservoir, air will enter the system. Refill the A3 tank with fresh DOT 4 fluid and thoroughly bleed your brakes until the lever or pedal feels firm and responsive.
