Rear Brake Master Cylinder – Hyosung GT125 GT125R GT250R GT250
Restore solid mechanical leverage back to your foot pedal assembly. Since the original factory hydraulics are permanently discontinued, this durable aftermarket alternative provides a trusted path to fix a sagging or bypassing system. It ensures consistent line compression without resorting to sketchy unbranded items that fail under sudden emergency stops.
- Safety First // Bench-tested on heavy-duty GT650 and GV650 machines with absolute pressure stability.
- Aftermarket Quality // Engineered with tight internal bore tolerances that outperform typical generic budget clones.
- Direct Fit // Correct fluid reservoir orientation designed to align with classic GT125 and GT250 heel plates.
- 📦 Note // Mounting fasteners are not supplied in the box; you may need alternate length bolts.
Description
When the original rear brake master cylinder went out of production, owners were left with very few dependable replacement options. Because hydraulic circuit function is absolutely non-negotiable, we sourced a proven aftermarket assembly that generates the exact fluid compression required, backed by extensive testing on high-mass 650cc twin frames. It is a solid, practical upgrade to restore consistent footway feedback and predictable stop control.
💎 Technical Performance Spec
| Proven Hydraulic BorePiston dynamic capacity successfully vetted on high-spec 650cc models. | Premium Seal ProfilesTough internal rubber rings designed to withstand active pressure spikes. |
| Leak-Free AssuranceMaintains uniform internal fluid pressure without weeping or cylinder bleed. | Long-Term EngineeringHeavy-walled casing material built to withstand years of hard seasonal riding. |
📜 Model Fitment Guide
Confirmed Chassis Matches: Fits GT125, GT125R, GT125RC, GT250, and GT250R models manufactured from 2003 through 2020.
69609HN9100, 69609HN9101, 69609HP9502, 69609HP9503, 69609HC9700
You will need fresh, clean DOT 4 brake fluid to prime and install this assembly successfully. Never reuse old, discoloured fluid from your reservoir lines. We recommend grabbing an inline one-way bleed valve tool to make purging air pockets straightforward.
🔧 Brake Safety & Install Tips
- Professional Alignment: Hydraulic brakes are critical for survival. If you are not confident bleeding out soft lines, have a professional bike garage handle the work.
- Fresh Fluid Only: Always purge the air using a freshly opened, sealed can of DOT 4 fluid. Exposed fluid absorbs moisture from the air, which leads to spongy performance.
- Check Bracket Bolts: Aftermarket casting lines may use a marginally narrower mounting eyelet bore. Keep a few alternate washers or bolts nearby to ensure a flush, secure fit against the frame.
If you want to verify your brake lines, drop us an email. For bleeding tips or peer work guides, head to the forums.
Additional information
| Weight | 1.1 kg |
|---|---|
| Dimensions | 20 × 20 × 7 cm |
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GARAGE PICKS // ADD TO BUILD
-
Stainless Steel Rear Brake Line [Hose Kit] – Hyosung GT650 GT125R GT250 GT125
£59.99 -
![Titanium Cylinder Head Cover Bolts [x4] [Engine Valve Rocker Cam] :: Hyosung GV250 GV125 GT125 GT125R GT250 GT650 GV650 GD250 MS3](https://i0.wp.com/hyoriders.club/wp-content/uploads/2020/11/GT-Cylinder-Head-Cover-Bolts-Valve-Rocker-Cam-Hyosung.jpg?fit=362%2C362&ssl=1)
Titanium Cylinder Head Cover Bolts [x4] [Engine Valve Rocker Cam] – Various Hyosung Models
£21.99 -
TiTANIUM (Ti) Brake Disc Rotor Bolts – Hyosung GT125R GT650 GV250 GT250
£23.99 -
Brake Disc Rotor Bolts [x6] – Hyosung GT125R GT650 GV250 RX125 GT250 TE450
£12.99
EXPLORE // RELATED PRODUCTS
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Upgrade Regulator Rectifier [Big Heatsink] – Hyosung GT/GV 125 250 Carb Models
£34.99 -
Complete Stainless Steel Engine Bolt Kit – Hyosung GT GT125R GV125 GT250R GV250
Price range: £18.00 through £21.00 -
Heavy Duty Clutch Springs Set – Hyosung GV650 GT650R GT650
Price range: £22.00 through £25.00 -
Anodized Magnetic Oil Filler Cap Plug Bolt – GT125R GV125 GT125 Hyosung
£9.99
Independent Shop supplying ride enhancements and quality spares with fast dispatch. Need assistance? Access our workshop guides, manuals, tutorials or drop by the forums for troubleshooting help.
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