Royal Enfield 594393/A – Rear Brake Light Switch with Spring for Thunderbird 350/500, Thunderbird X 350/500 & Rumbler 500 – Genuine OEM

The Royal Enfield 594393/A – Rear Brake Switch (Brake Light Switch with Spring) is the genuine OEM switch used on Thunderbird 350 / Thunderbird 500, their Thunderbird X variants, and the export Rumbler 500.

The official Thunderbird 350/500 parts catalogue lists 594393/A as “Brake Light Switch with Spring” in the rear brake pedal section, with one piece used for both 350 and 500 models. Royal Enfield rate lists describe 594393/A simply as “REAR BRAKE SWITCH”, confirming its role as the OEM rear brake light switch.

Trusted European fiche sites list the part as “REAR BRAKE SWITCH / CONTACTEUR FREIN AR”, with 594393/B as the later revision, indicating this is the original factory design. Specialist exporters and dealers (care2spare, OEMShip, etc.) sell 594393/A specifically as a rear brake switch for Thunderbird 350, Thunderbird 350 ABS, Thunderbird 500, Thunderbird 500 ABS, Thunderbird X 350 ABS, Thunderbird X 500 ABS and Rumbler 500.

This switch is activated by the rear brake pedal and completes the circuit to your tail lamp, illuminating the brake light whenever you press the pedal. A worn, jammed or water-damaged switch can cause no brake light, intermittent operation, or permanent ON, which is both unsafe and a quick way to fail a road check.

Replacing it with a genuine 594393/A restores proper brake-light function with correct spring tension, plug type and mounting thread—a small but critical safety component for every Thunderbird/Rumbler owner.

Key Features 

• Genuine Royal Enfield OEM part – Part No. 594393/A, officially described as “REAR BRAKE SWITCH / Brake Light Switch with Spring”.

• Verified fitment for Thunderbird 350 & Thunderbird 500 (including ABS variants) via multiple OE dealers and eBay business sellers.

• Confirmed compatibility with Thunderbird X 350 ABS / Thunderbird X 500 ABS / rear disc variants from European listings and Thunderbird X-specific catalogues.

• Used on Rumbler 500 (Latin American Thunderbird 500) according to Rumbler 500 spare parts catalogue and international sellers.

• Integrated plunger switch + return spring correctly calibrated for the OEM rear brake pedal.

• Direct plug-and-play connector – no cutting or splicing into the wiring harness when used on the listed models.

• Helps ensure reliable brake light operation, improving rider safety and road-worthiness.

• Ideal for bikes with dead brake light, intermittent operation, or restoration/after repaint where the old switch is corroded.

• Supplied as a single switch assembly with spring; designed to screw into the original mounting bracket.

Compatibility Table 

*Years are approximate based on model production runs; part number fitment is taken from catalogues and dealer mappings.

DO CHECK PART NUMBER BEFORE PURCHASE 

Variants

• 594393/A – Rear Brake Light Switch with Spring (This Listing)

• In some markets, fiche shows 594393/B as an updated revision of the same switch.

“You may receive 594393/A or the latest supersession 594393/B depending on Royal Enfield’s current packing – both are genuine and fully interchangeable for the models listed above.”

FAQs 

Q1. What exactly does part 594393/A do?
It is the rear brake light switch activated by the rear brake pedal. When you press the pedal, the switch closes the circuit and turns on your brake light. The official TB 350/500 parts catalogue calls it “Brake Light Switch with Spring”, confirming this function.

Q2. How do I know if this is the correct switch for my bike?
If you ride a Thunderbird 350/500 (including ABS), Thunderbird X 350/500 or Rumbler 500, this is the OEM switch used by Royal Enfield. Cross-check your EPC or existing part label for 594393/A (or 594393/B) and match the connector and mounting style. You can also share your VIN and clear photos with us before ordering for an extra check.

Q3. My brake light is not working from the pedal but works from the front lever. Is this the fix?
Yes, that symptom usually points to a faulty rear brake switch or its wiring. If the front lever (front brake switch) still lights the lamp but the rear pedal doesn’t, replacing the rear switch (594393/A) is the first thing most workshops do after checking wiring and adjustment.

Q4. Can I use this on a Classic or Bullet model?
We do not recommend that. Official catalogues and serious dealers map 594393/A only to Thunderbird / Thunderbird X / Rumbler 500 family. Other models use different brackets, thread lengths or connectors. For Classic/Bullet/Electra or J-Series bikes, please use the correct, dedicated part number to avoid fitment issues.

Q5. Is installation difficult?
On most Thunderbirds it’s a simple job: unscrew the old switch from the bracket, disconnect the plug, screw in the new switch with its spring positioned correctly, then reconnect the plug and adjust so the brake light comes on with light pedal pressure. If you’re not confident with electrical checks, have a Royal Enfield mechanic install and adjust it.