Royal Enfield
Royal Enfield Front Brake Master Cylinder Assembly with Lever for Thunderbird 350 & Thunderbird 500 – 594631/A
Royal Enfield Front Brake Master Cylinder Assembly with Lever for Thunderbird 350 & Thunderbird 500 – 594631/A
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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
Royal Enfield Front Brake Master Cylinder Assembly with Lever for Thunderbird 350 & Thunderbird 500 – 594631/A
594631/A is a genuine Royal Enfield front brake master cylinder assembly with lever. OEM-style Royal Enfield parts sources identify this exact part number as MASTER CYLINDER ASSY FR. DISC - NT LEVER, while the older number 594631 is shown as replaced by 594631/A.
This is the correct OEM replacement when the original front brake master cylinder is leaking, seized, crash-damaged, internally worn, or supplied without a usable lever assembly. Buyers may also search for it as Thunderbird 350 front master cylinder, Thunderbird 500 brake master cylinder, front brake pump Royal Enfield, brake lever master cylinder assembly, and NTB front brake master cylinder.
The strongest fitment evidence points to the Thunderbird family, specifically Thunderbird 350 / NTB 350 and Thunderbird 500 / NTB 500. This is a complete front master cylinder assembly with lever, not just the lever and not just a repair kit.
Why Buyers Need It
This part is usually replaced when front brake feel becomes poor due to internal wear, fluid leakage, crash damage, broken lever mount area, or a seized piston assembly. Replacing the complete OEM master cylinder assembly is often the cleaner solution than mixing local repair parts into a safety-critical brake component.
Key Features
- Genuine Royal Enfield OEM brake part
- Part number: 594631/A
- Official description: Master Cylinder Assy Fr. Disc - NT Lever
- Replacement / supersession for older part number 594631
- Sold as a front brake master cylinder assembly with lever
- Strong fitment support for Thunderbird 350 and Thunderbird 500
- Safety-critical OEM replacement for front disc brake controls
Verified Compatibility
| Model | Status | Notes |
|---|---|---|
| Thunderbird 350 / NTB 350 | Confirmed | Direct seller fitment explicitly lists NTB 350 for this master cylinder family. |
| Thunderbird 500 / NTB 500 | Confirmed | Direct seller fitment explicitly lists NTB 500 for this master cylinder family. |
| Other Royal Enfield models | Do not assume | This listing is kept conservative around the strongest proven Thunderbird-family fitment. |
What’s in the Box
- 1 x Genuine Royal Enfield Front Brake Master Cylinder Assembly with Lever – 594631/A
Buyer-Focused Fitment Note
Please order only after matching your bike to the Thunderbird 350 / Thunderbird 500 front disc brake setup and confirming the old part number. This is a complete front master cylinder assembly with lever, not just the lever and not just a repair kit.
FAQs
1. What is 594631/A?
It is the genuine Royal Enfield front brake master cylinder assembly with lever.
2. Which bikes can I safely buy this for?
The strongest current fitment support is for Thunderbird 350 / NTB 350 and Thunderbird 500 / NTB 500.
3. Is it OEM?
Yes. It is listed as a genuine Royal Enfield part in OEM-style parts sources.
4. Did it replace an older part number?
Yes. 594631 is shown as replaced by 594631/A.
5. Is it only the lever?
No. It is the master cylinder assembly with brake lever, not just the lever.
6. Is this the front or rear master cylinder?
This is the front brake master cylinder.
7. What should I check before ordering?
Check your bike model, front brake setup, old master cylinder number, and exact part number 594631/A.
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Verify Fitment on Official Brand Portals
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
