Name: Front Brake Master Cylinder - Hyosung GT125 GT125R GT250R GT250
SKU: 59600HR7700-GT250RC
Availability: InStock

Front Brake Master Cylinder – Hyosung GT125 GT125R GT250R GT250

Estimated delivery dates: May 2, 2026 - May 4, 2026

£69.99

💎 FRONT BRAKE MASTER CYLINDER | PERFORMANCE UPGRADE

South Korean Made & Workshop Proven. Hyosung has stopped producing the original GT125/GT250 units, but we have you covered. This unit is 2x larger than OEM and powerful enough for single or dual-disc setups. We use these on our own custom builds—if it’s good enough for us, it’s good enough for you.

✔ Aftermarket & Made In South Korea!

❕❗ Note: Fits all Naked GTs (2003-2020) and GTRs with updated “RC” 2012-2020 fairings only (they have a literal diamond shape headlight too)

GTR 2012-2020 ✔ Compatible	GTR 2005-2011 ❌ NOT compatible

⛔ NOT SUITABLE FOR 2005-2011 GTR FAIRINGS

📸 PROVEN ON OUR BUILDS (GV AQUILA CUSTOM):

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✅ South Korean Build: Quality you can trust (No AliExpress junk).
🛠️ Dual-Disc Ready: Massive stopping power for all 125/250 models.
⚙️ 2x Larger Bore: Superior fluid displacement and lever feel.

💡 PRO TIP: Real garages buy these from us because they fit and they work.
⚠️ If you have an older 2005-2011 GTR, contact us for a smaller alternative to avoid fairing interference BEFORE buying!

Description

When the original GT125/GT250 front master cylinders were discontinued, the market was flooded with cheap, unsafe universal clones. We refuse to supply £10 junk because your brakes are your life. Sourced directly from South Korea, this aftermarket unit is a workshop-grade upgrade. It provides a significant increase in fluid pressure and has been rigorously tested on our own custom Hyosung builds and dual-disc 650cc models.

💎 Precision Braking, Workshop Trusted

Built to handle more than your 125 or 250 requires—offering massive safety margins.

Korean Engineering Superior seals and piston tolerances.	High Pressure 2x larger bore for instant bite and feel.
Twin-Disc Power Capable of stopping heavy 650cc machines.	Bespoke Finish Clean, professional look for your handlebars.

📜 Confirmed Fitment Guide

✅ FITS: GT125/GT250 Naked (2003–2020) | GTR Models (2012–2020 RC Versions)
❌ WILL NOT FIT: 2005–2011 GTR fairings (hits dash panel on full lock).
🔧 OEM REF: 59600HR7700, 59600-35C03, 59687-35C00, 59669-36510, 59610-35C00, 59691-35C00, 59600HP9203, 59600HP9201, 59600HN9102

💡 PERFORMANCE PAIRING:
Combine this master cylinder with Braided Brake Lines for the ultimate braking setup. Braided lines won’t swell under pressure, giving you a firm, consistent lever feel that matches the power of this unit.

🔧 Safety & Installation Tips

Professional Install: Brakes are critical. If you aren’t experienced in bleeding hydraulic systems, have a professional bike garage handle the installation.
Fluid Choice: Use only fresh, high-quality DOT 4 fluid. Never leave the reservoir open to the air longer than necessary.
Clearance Check: Once installed, turn the bars fully to the left and right. Ensure there is no binding or contact with fairings or tank.

📧 FITMENT QUESTIONS? Email us with your bike details. For technical help or community opinions, visit the HyoRiders Forums.

This master cylinder fits all GT125/GT250 Naked models (2003–2020), but only fits GT125R/GT250R (GTR) with updated fairings (2012–2020).

GTR 2012–2020 (RC)
✔ Compatible
(See pic) Front Brake Master Cylinder - Hyosung GT125 GT125R GT250R GT250

GTR 2005–2011
❌ NOT Compatible
(See why below) Front Brake Master Cylinder - Hyosung GT125 GT125R GT250R GT250

Important Note:
Older 2005–2011 GTR fairings sit closer to the lever and master cylinder. Turning the bars fully left will cause this bigger aftermarket unit to hit the black panel surrounding the digital speedometer.
➡ If you have a 2005–2011 model, contact us for a smaller alternative.