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    UNDER THE HOOD

    Royal Enfield KAB00039/A – Master Cylinder Major Kit (ETL) for Bullet 350 ES Disc BS4 – Genuine OEM

    Royal Enfield KAB00039/A – Master Cylinder Major Kit (ETL) for Bullet 350 ES Disc BS4 – Genuine OEM

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    Important Order Policy
    Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

    Restore crisp, consistent braking with the Royal Enfield KAB00039/A Master Cylinder Major Kit (ETL). This genuine OEM overhaul kit services the disc-brake master cylinder used on the Bullet 350 ES Disc (BS4), replacing the high-wear internal parts to bring back proper hydraulic pressure and lever feel. The kit (ETL = Endurance Technologies, the OE brake supplier to RE) is engineered to factory tolerances for a direct, reliable rebuild—ideal when your lever feels spongy, you notice fluid bypass/leaks, or the piston/seals are worn.

    Because it’s OEM, components match the original bore and materials for long service in Indian riding conditions. Installation is straightforward for an experienced technician: disassemble the master cylinder, clean the body, install the new piston/springs/seals (as supplied in the OEM pack), reassemble, and bleed the system with fresh DOT fluid.

    Verified fitment: Bullet 350 ES Disc (BS4) master cylinder using the ETL unit. For other models, confirm your existing master cylinder part code and ETL marking before purchase. The Spares CompanyRoyal Enfield Parts

    Key Features

    • OEM Royal Enfield kit — Part No. KAB00039/A (Master Cylinder Major Kit_ETL). Royal Enfield Parts+1

    • Designed to fully overhaul the ETL master cylinder (piston, seals, springs & hardware as per OEM pack). Royal Enfield Parts

    • Verified compatibility: Bullet 350 ES Disc (BS4) front brake master cylinder. The Spares Company

    • Restores hydraulic integrity & lever feel; reduces internal leakage.

    • Direct fit with factory dimensions; no machining required.

    • Built to Endurance (ETL) OE standards for durability. Endurance

    Compatibility (strictly verified)

    • Fits: Royal Enfield Bullet 350 ES Disc – BS4 (ETL master cylinder). The Spares Company

    • Not confirmed for Classic 350/500 UCE, Electra, Thunderbird, J-Series (Reborn/Meteor/Hunter) or 650/411 platforms. Please match your master cylinder’s supplier (ETL) and part code before ordering. Royal Enfield Parts

    Variants / Related OEM Kits (for clarity)

    If your service need is different, RE also lists:

    • KAB00040/A – Master Cylinder Minor Kit (ETL)

    • KAB00041/A – Master Cylinder Seal Kit (ETL)

    • KAB00042/A – Master Cylinder Push Rod–Fork Kit (ETL)
      (these part names/codes are per RE’s official price/parts inde

    Verify Fitment on Official Brand Portals

    For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

    Royal Enfield Official Spares Portal

    Hero MotoCorp Official eCatalogue

    View full details