{"product_id":"brake-master-cylinder-sight-glass-o-ring-10-pack-motorcycle-atv","title":"10-Pack Brake Master Cylinder Sight Glass with O-Ring | Moto \u0026 ATV","description":"\n\u003ch2\u003eUniversal Brake Master Cylinder Sight Glass Set – 10 Pieces with O-Rings\u003c\/h2\u003e\n\u003cp\u003eKeep a clear eye on your brake fluid levels with this \u003cstrong\u003e10-piece Brake Master Cylinder Sight Glass Set\u003c\/strong\u003e. Designed as a universal replacement for most motorcycles and ATVs, each kit includes a durable resin lens and a rubber O-ring seal, giving you everything you need for a leak-free, crystal-clear view of your brake pump reservoir.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClear Resin Lens:\u003c\/strong\u003e Thickened, high-transparency resin construction delivers an unobstructed view of brake fluid levels — no guesswork, no leaks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Rubber O-Ring:\u003c\/strong\u003e Each sight glass comes paired with a resilient rubber O-ring featuring strong rebound and aging resistance for a reliable, long-lasting seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Compatible with the majority of motorcycles and ATVs — a go-to replacement for worn or damaged brake master cylinder windows.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComprehensive Value Pack:\u003c\/strong\u003e 10 complete sets (lens + O-ring) in one package — enough spares to keep on hand for future maintenance needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Drop-in replacement design makes swapping out old or cloudy sight glasses straightforward, even for home mechanics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e 12mm \/ 14.5mm \/ 18mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 10 sets (sight glass + O-ring each)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLens Material:\u003c\/strong\u003e High-clarity resin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeal Material:\u003c\/strong\u003e Durable rubber\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Universal – most motorcycles and ATVs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Please allow 2–3% dimensional variance due to manual measurement. Actual color may vary slightly from images depending on monitor settings.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-50-psi-dial-tire-pressure-gauge-car-motorcycle-bike\"\u003e0–50 PSI Dial Tire Pressure Gauge – Car, Motorcycle \u0026amp; Bike\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-pin-pre-wired-glow-plug-connector-vw-audi-bmw-fiat-ford-55200755\"\u003e1-Pin Pre-Wired Glow Plug Connector | VW Audi BMW Fiat Ford\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-5l-electric-high-pressure-foam-sprayer-portable-car-wash-gun\"\u003e1.5L Electric Foam Sprayer – Portable High-Pressure Car Wash Gun\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafe Riding Resources\u003c\/h3\u003e\n\u003cp\u003eFor general motorcycle safety tips and best maintenance practices, visit the National Highway Traffic Safety Administration or review brake system inspection guidelines at CPSC.gov.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes are included in the brake master cylinder sight glass set?\u003c\/h4\u003e\n\u003cp\u003eA: The sight glasses are 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these sight glasses compatible with my motorcycle or ATV?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — these brake master cylinder sight glasses are designed as universal replacements compatible with most standard motorcycles and ATVs. They feature a straightforward drop-in design, making installation simple for most riders and home mechanics.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How does the O-ring seal prevent fluid leaks?\u003c\/h4\u003e\n\u003cp\u003eA: Each sight glass comes with a high-quality rubber O-ring engineered for strong rebound and aging resistance. When correctly seated, the O-ring creates a tight seal around the sight glass window, effectively preventing brake fluid from seeping out of the reservoir.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why do I need to replace my brake master cylinder sight glass?\u003c\/h4\u003e\n\u003cp\u003eA: Over time, sight glasses can become cloudy, cracked, or develop worn seals, making it difficult to accurately monitor brake fluid levels. A clear, properly sealed sight glass is essential for maintaining visibility of your brake fluid and ensuring safe, confident braking performance on every ride.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes are included in the brake master cylinder sight glass set?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The sight glasses are available in three sizes — 12mm, 14.5mm, and 18mm — to suit a wide range of motorcycle and ATV brake master cylinder reservoirs. 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