10-Pack Motorcycle Brake Master Cylinder Sight Glass & O-Ring
10-Pack Motorcycle Brake Master Cylinder Sight Glass & O-Ring
Keep a clear eye on your brake fluid levels with this 10-Pack Brake Master Cylinder Sight Glass Set. Designed as a universal replacement for most motorcycles and ATVs, each kit includes a high-clarity resin lens and a durable rubber O-ring seal — everything you need for a clean, leak-free installation.
Made in Mainland China.
Key Features
- Crystal-Clear Resin Lens: Thickened resin construction provides an excellent viewing angle so you can monitor brake fluid levels at a glance — deformation-resistant and built to last.
- Durable Rubber O-Ring Seal: Each sight glass comes paired with a high-quality rubber O-ring featuring strong rebound and aging resistance, ensuring a tight, leakproof seal every time.
- Universal Fitment: Compatible with the vast majority of motorcycles and ATVs, making these an ideal stock-up part for workshops and home mechanics alike.
- Available in Three Sizes: Choose from 12mm, 14.5mm, or 18mm to match your specific brake master cylinder reservoir.
- Comprehensive Value Pack: Ten complete sets (lens + O-ring) in every package — plenty of spares on hand for future maintenance needs.
Specifications
- Material: Resin lens + rubber O-ring
- Sizes Available: 12mm / 14.5mm / 18mm
- Package Quantity: 10 pieces (sight glasses + O-rings)
- Compatibility: Universal — most motorcycles and ATVs
- Country of Origin: Made in Mainland China
Please allow 2–3% dimensional variance due to manual measurement. Actual product color may differ slightly from images due to monitor calibration differences.
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Learn more: FuelEconomy.gov driving efficiency guidance
Frequently Asked Questions
Q: What sizes does the brake master cylinder sight glass come in?
A: This set is available in three sizes — 12mm, 14.5mm, and 18mm — to suit a wide range of motorcycle and ATV brake master cylinder reservoirs. Please measure your existing sight glass before ordering to ensure the correct fit.
Q: Are these sight glasses compatible with all motorcycles?
A: These are designed as universal replacements and are compatible with most motorcycles and ATVs that use a standard brake master cylinder reservoir window. We recommend verifying the diameter of your current sight glass against the available sizes (12mm, 14.5mm, 18mm) to confirm compatibility.
Q: Do the O-rings come included with each sight glass?
A: Yes — each of the 10 pieces in the package includes both a resin sight glass lens and a matching rubber O-ring seal, giving you complete replacement sets ready to install without sourcing additional hardware.