BLUE LINE
Blue Line 18mm Brake Master Cylinder Sight Lens
Description
Check your brake-fluid level at a glance again with this Blue Line brake master cylinder sight lens. Supplied with an O-ring, this replacement lets you renew a damaged or cloudy viewing window on a compatible master cylinder without replacing the entire assembly. The nominal 18 mm lens has an 18.2 mm outer diameter, so compare your original lens and reservoir opening before ordering.
Key Features
- Clear fluid-level viewing: Replaces the reservoir sight window so you can monitor the fluid level
- Included O-ring: Provides the sealing component for installation in a compatible master cylinder
- Compact replacement: Renews the viewing window rather than the entire master cylinder when the remaining assembly is serviceable
- Size-based fitment: Nominal 18 mm size with an 18.2 mm outer diameter
Technical Specifications
- Brand: Blue Line
- Part number: 1000-1378
- Part type: Brake master cylinder reservoir sight lens
- Nominal size: 18 mm
- Outer diameter: 18.2 mm
- Included: One sight lens and one O-ring
Compatibility
| Scooter engine platform | Applications |
|---|---|
| 139QMB-based 50cc / 80cc scooters | 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, and other compatible QMA/QMB applications |
| GY6-based 125cc / 150cc / 169cc scooters | 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, and other compatible QMJ/QMK/QMI applications |
These scooter platforms must have a master cylinder that accepts this lens and O-ring. Match the original lens diameter, seating profile, and reservoir opening before ordering. Engine code or displacement alone does not establish brake master cylinder fitment.
Have the sight lens installed by a qualified technician. The master cylinder must be checked for correct fluid level, secure seating, and leaks before the vehicle is ridden.
Product Diagrams
Features
Specifications
Brand: Blue Line; Part number: 1000-1378; Type: Brake master cylinder sight lens; Nominal size: 18 mm; Outer diameter: 18.2 mm; Includes: One lens and one O-ring; Fitment: Match original lens, seating profile, and master-cylinder opening
Model Fitments
Brands: Amstar, Amigo, Ascend, Baotian, Bashan, Blade, Boom, Chicago Scooter Company, Dongfang, Roketa, Baotian, Bashan, BMS, Cool Sports, E Ton, Fly Wing, Eagle, Fly, Italica, Riya, Ice Bear, Jackel, Jet Moto, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, Keeway, KMD, Kymco, Lance, Lifan, Linhai, Loncin, Longbo, Fuxin, Jiajue, Tao Tao, Tao Motors, Trailmaster, Maxtrade, Meitien, Motofino, Motorino, NST, Panterra, Panther, Qlink, Yiben, Red Streak, Redcat, Roketa, Schwinn, Strada, SYM, Tank, Terminator ,Tomberlin, TNG, United Motors, Vento, Vitacci, Wildfire, Wolf, X-Treme, X-Pro, Yongfu, ZNEN, Zhongneng , Zhilong, Geely, Wangye, ZH and more Manufactured by: Taizhou Zhongneng Motorcycle Co.; Jiangsu Zhongneng Motorcycle Co.; Jiangsu Meijunte Technology Co.; Taizhou Qianxin Vehicle Co.; Ningbo Dongfang Lingyun Vehicle Made Co.; Taizhou Zhilong Technology Co.; Zhejiang Jiajue Motorcycle Manufacturing Co.; Zhejiang Gelly Ming Industrial Co.; Taizhou City Senglong Motorcycle Manufacture Co.; Jiangsu Sacin Motorcycle Co.; Jiangsu Linhai Power Machinery Group Co.; Zheijiang TaoTao Vehicles Co.; Zhejiang Senling Motorcycle Co.; Sanmen County Yongfu Machine Co; Taizhou Jiaojiang Zhiwei Motorcycle Manufacture Co.; Huzhou Daixi Zhenhua Technology Trade Co.; Taizhou Zhongneng Motorcycle Co.; Zhejiang Riya Motorcycle Co.; Ningbo Longjia Motorcycle Co.; Taizhou Zhongneng Motorcycle Co.; and more
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
