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Rear Brake Stop Light Switch - Hyosung GV125-S EFi [Bobber 125 S] 37740KG7200-GV125S
Rear Brake Stop Light Switch - Hyosung GV125-S EFi [Bobber 125 S] 37740KG7200-GV125S
Rear Brake Stop Light Switch - Hyosung GV125-S EFi [Bobber 125 S] 37740KG7200-GV125S

Rear Brake Stop Light Switch – Hyosung GV125-S EFi [Bobber 125 S]

Estimated delivery dates: Aug 25, 2026 - Aug 26, 2026

£14.99

💎 REAR BRAKE STOP LIGHT SWITCH // GV125-S BOBBER EFi CBS MODELS

Restore immediate brake light activation on your Bobber. This hydraulic pressure switch hooks directly into your rear master cylinder to engage your stop light instantly during daily rides on everyday roads.  With this replacement rear brake light switch, you can get back on the road sooner & stay safer with working lights!

  • Wiring // Outfitted with a standard 2-pin white male plug to snap directly into the original factory female wiring port.
  • Fitment // Engineered strictly for the CBS (Combined Braking System) setup found on the original generation 125cc Bobber chassis (GV125-S EFi  / Aquila 125 S).
  • Finish // Aftermarket production hardware with a clean silver or black body finish, replacing your worn factory unit perfectly.
  • Hardware // Supplied with a fresh set of washers so you do not have to mess around reusing old crushed seals.
💡 PRESSURE NOTE: Unlike older legacy models that use a mechanical pull-spring setup, this modern unit triggers directly from fluid pressure when you apply foot force. You will need to bleed your brakes again or if you are not sure, it is best to let a garage do it for you since the bike uses CBS brakes (Combined Front And Rear braking system) .
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Description

Over time, the internal electric contacts of your rear brake light switch can wear out or corrode from road rain and salt, leading to a completely dead or flickering brake light. This is a vital safety part that needs a proper swap to keep you visible on local roads. This specific aftermarket sensor is a pressure-activated switch built for the combined braking layout. It mounts right into your fluid hose port on the rear master cylinder, making it a straight plug-and-play fix for your wiring loom.

💎 HYDRAULIC PRESSURE SWITCH SPECIFICATIONS

Pressure ActivatedTriggers the brake bulb instantly using internal fluid pressure instead of old-style external pull springs. Sealing Washers IncludedShips with fresh washers to ensure a clean, leak-free reassembly of this rear brake light switch.
Silver or Black FinishShipped primarily with a clean silver metallic finish that fastens directly into the brake line. Factory Part MatchBuilt to replace original production parts list number 37740KG7200.

📜 Confirmed Fitment Guide

Combined Braking System (CBS) Group: Fits the liquid-cooled V-Twin bobber model shown below. Check your bike shape against this photo to confirm you have the exact same model line.

  • Hyosung GV125-S Bobber EFi: Fits original CBS models built from 2018 onwards.

Hyosung part upgrade gv125s bobber cruiser shape look

❌ WILL NOT FIT THESE MOTORCYCLES:

  • ABS Generation Models: This will not fit the GV300S, GV125S-EVO, or GV125X. These uprated models use ABS sensor networks instead of a linked CBS hydraulic switch.
  • Older Carburettor Cruisers: Will not work on classic air-cooled GV125 or GV125C models. Those legacy frames use old-style rear drum brakes with manual spring pulling switches and wire tips.
💡 RECOMMENDED HARDWARE PAIRING: While you are refreshing your lower chassis brake electrics, it is a very smart move to look over your handlebar setup too. If you are chasing a front lever fault, we carry separate matching options. View Electrical Spares here.

🔧 Install Tips

  • CBS Safety Warning: Because this switch sits directly inside your brake line master cylinder bolt hole, fitting it requires unbolting the fluid circuit. This means you will need to bleed your brakes correctly after putting it back together. Because the GV125-S uses linked CBS brakes, both front and rear lines connect to the master cylinder. ⚠️ If you are not 100% sure how to bleed air out of a linked brake system, please consult your local garage to do the work safely!
  • Fresh Washers Only: Place one of the new sealing washers on each side of the hose metal eyelet before twisting the new switch bolt into the master cylinder. Do not reuse your old flattened rings.
  • Check Your Plug: Ensure your bike’s ignition is completely off before uncoupling the old wires. Clean any road spray out of the harness connector socket before snapping the new white male plug into place.
📧 WORKING ON Your CBS HYDRAULIC MASTER CYLINDER FASTENERS? If you want to check your caliper wire connections or show us your current setup to see if it matches, you can upload a photo and share it with other riders on the forum. For quick sales support, email us your question or if you want to look over bleeding troubles, head straight to the forums and start a topic!
SKU: 37740KG7200-GV125S Categories: , Tags: , , , , , , , , , , ,

Additional information

Weight 0.5 kg
Dimensions 10 × 10 × 3 cm

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