Product Description
The B20202900O is an OE-grade (Original Equipment) assembly manufactured by Endurance Technologies, the official brake system supplier for Royal Enfield. This unit is essential for maintaining the hydraulic pressure required to actuate the front brake calipers. It is a common replacement for master cylinders that have developed internal seal leaks, a “spongy” lever feel, or physical damage to the reservoir.
The assembly comes as a ready-to-install kit, including the master cylinder body, an integrated fluid reservoir with a transparent sight glass, a pre-installed brake lever, and the electronic brake light switch. The body is finished in a weather-resistant black coating that matches the factory look of the Classic and Bullet handlebars.
Key Features:
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Complete Hydraulic Solution: Includes the piston assembly, reservoir, reservoir cap, brake lever, and the 2-pin brake light switch.
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Integrated Sight Glass: Features a clear window for instantaneous monitoring of DOT 4 brake fluid levels and condition.
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OEM Endurance Quality: Built to factory tolerances, ensuring 100% compatibility with the standard 10mm banjo bolt and brake lines.
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Ergonomic Lever Design: The included aluminum lever is shaped for a comfortable 2-finger or 4-finger grip, providing progressive braking feedback.
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Direct Bolt-On: Designed for standard 7/8″ (22mm) handlebars, making installation straightforward with no modifications to the wiring or hoses.
Technical Specifications:
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Part Number: B20202900O (also associated with RE Part No. 147650/A)
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Brand: Endurance Technologies Limited
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Application: Front Disc Brake System
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Bore Size: ~14mm (Optimized for single-piston and twin-piston calipers)
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Brake Fluid: Use DOT 4 only (as specified on the reservoir cap)
Vehicle Compatibility:
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Royal Enfield Classic 350 / 500 (UCE Models, BS3 & BS4)
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Royal Enfield Bullet 350 ES (Electric Start UCE Models)
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Royal Enfield Electra 350 (UCE Models)
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Royal Enfield Thunderbird 350 / 500 (UCE Variants)
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Note: This unit is specifically for UCE-based models. It is NOT compatible with the newer J-Series (Meteor/Reborn) which uses a different reservoir and mounting design.











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