{"product_id":"fenwicks-dot-5-1-brake-fluid-80ml-tube-hydraulic-brake-bleeding","title":"Fenwick's DOT 5.1 Brake Fluid 80ml Tube – Hydraulic Brake Bleeding","description":"\u003cp\u003e\u003cstrong\u003eFenwick's DOT 5.1 Brake Fluid\u003c\/strong\u003e is a high-performance hydraulic brake fluid supplied in a clever \u003cstrong\u003e80ml laminated foil tube\u003c\/strong\u003e that replaces the traditional syringe-and-bottle approach to brake bleeding. The tube format allows precise, controlled dispensing directly into the brake system without spills or mess — a genuinely practical improvement over pouring from a bottle, particularly when bleeding brakes solo or in a workshop setting where cleanliness matters. The laminated foil interior protects the fluid from moisture absorption and contamination right up to the last drop, preserving its effectiveness throughout the tube's life.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDOT 5.1\u003c\/strong\u003e is the highest-specification glycol-based brake fluid, offering a \u003cstrong\u003ehigher dry boiling point than DOT 3 or DOT 4\u003c\/strong\u003e and excellent thermal stability under the demanding conditions of hard braking. It is fully compatible with DOT 3 and DOT 4 systems (being glycol-based, not silicone-based like DOT 5), making it a direct upgrade for any brake system that specifies DOT 3, 4, or 5.1 fluid. It provides superior moisture resistance compared to lower-spec fluids, helping to maintain braking performance and protect internal brake components from corrosion over time. Suitable for road, MTB, and gravel hydraulic disc brakes, as well as motorcycle and automotive brake systems that specify DOT 5.1.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e DOT 5.1 is glycol-based and is \u003cstrong\u003enot compatible with mineral oil brake systems\u003c\/strong\u003e (such as Shimano hydraulic brakes, which require mineral oil). Always check your brake manufacturer's specification before using. DOT fluid is also corrosive to paintwork — take care to avoid contact with frame surfaces during bleeding. Browse the full \u003ca href=\"\/collections\/fenwicks\"\u003eFenwick's range\u003c\/a\u003e or explore our \u003ca href=\"\/collections\/workshop\"\u003eworkshop and maintenance collection\u003c\/a\u003e for complementary products.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It's Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBleeding and topping up hydraulic brake systems that specify DOT 3, DOT 4, or DOT 5.1 fluid\u003c\/li\u003e\n\u003cli\u003e80ml laminated foil tube for precise, mess-free dispensing — replaces traditional syringe and bottle method\u003c\/li\u003e\n\u003cli\u003eHigher dry boiling point than DOT 3 or DOT 4 — superior thermal stability under hard braking\u003c\/li\u003e\n\u003cli\u003eFully compatible with DOT 3 and DOT 4 systems as a direct upgrade\u003c\/li\u003e\n\u003cli\u003eRoad, MTB, gravel hydraulic disc brakes, motorcycle, and automotive brake systems specifying DOT 5.1\u003c\/li\u003e\n\u003cli\u003eLaminated foil interior protects fluid from moisture and contamination until the last drop\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It's NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMineral oil brake systems\u003c\/strong\u003e (e.g. Shimano hydraulic brakes) — these require mineral oil, not DOT fluid. Using DOT fluid in a mineral oil system will damage seals and components\u003c\/li\u003e\n\u003cli\u003eBrake systems specifying DOT 5 (silicone-based) — DOT 5.1 is glycol-based and not compatible with DOT 5 silicone systems despite the similar name\u003c\/li\u003e\n\u003cli\u003eLong-term storage once opened — DOT fluid absorbs moisture from the air; use promptly after opening and do not store partially used tubes\u003c\/li\u003e\n\u003cli\u003eContact with paintwork — DOT fluid is corrosive to paint; protect frame surfaces during bleeding\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs DOT 5.1 compatible with my DOT 4 brake system?\u003c\/strong\u003e\u003cbr\u003eYes — DOT 5.1 is glycol-based and fully compatible with DOT 3 and DOT 4 systems. It can be used as a direct upgrade, offering a higher boiling point and better thermal stability. Always check your brake manufacturer's specification to confirm DOT fluid compatibility before bleeding.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between DOT 5.1 and DOT 5?\u003c\/strong\u003e\u003cbr\u003eDespite the similar names, DOT 5 and DOT 5.1 are fundamentally different fluids. DOT 5 is silicone-based and is not compatible with glycol-based systems. DOT 5.1 is glycol-based and is compatible with DOT 3 and DOT 4 systems. Do not confuse the two — using the wrong fluid type will damage brake seals and components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this with Shimano hydraulic brakes?\u003c\/strong\u003e\u003cbr\u003eNo — Shimano hydraulic brakes use mineral oil, not DOT fluid. Using DOT fluid in a Shimano mineral oil system will damage the seals and require a full system flush and rebuild. Always check your brake manufacturer's specification before adding any fluid.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow does the tube format work?\u003c\/strong\u003e\u003cbr\u003eThe 80ml laminated foil tube dispenses fluid directly and precisely, replacing the need for a separate syringe to draw fluid from a bottle. Squeeze the tube to dispense the required amount into your brake bleed kit. The laminated foil interior prevents moisture absorption and contamination, keeping the fluid fresh throughout the tube's use.\u003c\/p\u003e","brand":"Fenwick's","offers":[{"title":"Default Title","offer_id":45472134889647,"sku":"FEODOT518","price":6.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/1674472889-34698200.jpg?v=1768519828","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/fenwicks-dot-5-1-brake-fluid-80ml-tube-hydraulic-brake-bleeding","provider":"Swinnerton Cycles","version":"1.0","type":"link"}