Genuine Royal Enfield Rear Master Cylinder Major Repair Kit – For Classic 350 & 500 – Part No. 594689/A

Product Description The 594689/A Major Kit is the official OEM solution for servicing a spongy or leaking rear brake system. Over time, the internal rubber seals and pistons within the master cylinder can wear out due to heat and brake fluid contamination. This kit provides all the essential internal parts—including the piston assembly, primary and secondary seals, circlip, and dust boot—to fully restore hydraulic pressure. As a genuine Royal Enfield spare, every component in this kit is manufactured to strict tolerances to handle the high-pressure environment of the disc brake system. Using this kit is a cost-effective alternative to replacing the entire master cylinder assembly, provided the cylinder bore is still in good condition. Key Features: OEM Reliability: 100% original Royal Enfield parts (PN: 594689/A) for a factory-standard rebuild. Complete Overhaul: Includes all critical internal seals and hardware needed for a “Major” service. Safety Critical: Restores consistent hydraulic pressure and eliminates “brake fade” or fluid seepage. High-Grade Materials: Features EPDM rubber seals that are highly resistant to glycol-based brake fluids (DOT 3/4). Precision Fitment: Designed specifically for the rear brake master cylinders used on the UCE Classic platform. Technical Specifications: Part Number: 594689/A (Supersedes older 594689 variants) System Type: Hydraulic Disc Brake (Rear) Compatibility: DOT 3 / DOT 4 Brake Fluid Vehicle Compatibility: Royal Enfield Classic 350 / 500 (UCE Models with Rear Disc Brake) Royal Enfield Bullet 350 / 500 (Models equipped with Rear Disc) Note: This kit is for Rear Master Cylinders only. It is not compatible with the front brake assembly or the newer J-Series (Reborn) models which may use different cylinder diameters.