Overview
Brake Fluid DOT4 is a glycol-ether based hydraulic fluid specifically formulated for modern braking systems. It exceeds the performance requirements of earlier DOT3 fluids with higher dry and wet boiling points, making it suitable for vehicles subjected to heavy braking loads or high-temperature conditions. The DOT classification system was established by the U.S. Federal Motor Vehicle Safety Standards (FMVSS) under Standard No. 116. DOT4 fluids must maintain a minimum dry boiling point of 230°C and wet boiling point (containing 3.7% water) of 155°C, significantly reducing vapor lock risks compared to DOT3.
Physical and Chemical Properties
DOT4 brake fluid is a hygroscopic (water-absorbing) liquid with a viscosity index that remains stable across operating temperatures (-40°C to 230°C). Its borate ester additives provide enhanced high-temperature performance and better fluid life compared to DOT3 formulations. The fluid's compressibility is exceptionally low (bulk modulus ~1.8 GPa), ensuring immediate hydraulic pressure transfer in braking systems. Its rubber swell characteristics are carefully balanced to maintain seal integrity without excessive expansion of elastomeric components.
Main Applications
Primary applications include: passenger vehicles with ABS systems, light commercial vehicles, performance cars, and motorcycles. DOT4 is commonly specified by European and Asian manufacturers for late-model vehicles. In industrial contexts, it's used in certain hydraulic systems where its temperature stability and corrosion protection are advantageous. The fluid is not recommended for racing applications (where DOT5.1 or specialty fluids are preferred) or vehicles with silicone-based systems (which require DOT5).
Safety and Storage
DOT4 brake fluid is classified as harmful if swallowed (H302) and causes serious eye irritation (H319). Always use nitrile gloves and eye protection when handling. Spills should be contained with absorbent materials and cleaned immediately as the fluid can damage painted surfaces. Proper storage requires sealed containers made of polyethylene or coated metal to prevent moisture absorption and oxidation. Shelf life is typically 2-3 years unopened, but once opened should be used within 12 months. Never mix with mineral oil-based fluids or DOT5 silicone fluids.
B2B Procurement Guide
When sourcing DOT4 brake fluid wholesale, verify the supplier provides current FMVSS 116 compliance documentation and batch test certificates. OEM-approved formulations (meeting standards like ISO 4925 Class 4) command premium pricing but offer assured compatibility. Bulk shipments typically come in 200L drums or intermediate bulk containers (IBCs). Consider ordering with nitrogen blanketing for extended storage. For just-in-time supply, some distributors offer pre-packaged 1L bottles with tamper-evident seals. Minimum order quantities usually start at 100L for custom formulations.
Related Manufacturers
- 主营：液压油、变压器油、冷冻机油、昆仑刹车油、工业齿轮油、汽轮机油、空气压缩机油、导热油、导轨油、液力传动油、真空泵油、柴油机油、汽油机油、车辆齿轮油、防冻液、润滑脂、液压导轨油、通用锂基润滑脂、四代内燃机油、发动机冷却液、航空液压油、二硫化钼锂基润滑脂、低温液压油、柴油尾气净化液、高温润滑脂
- 主营：抗磨液压油、液力传动油、航空液压油、昆仑刹车油、工业齿轮油、汽轮机油、导热油、液压导轨油、真空泵油、空气压缩机油、变压器油、冷冻机油、柴油机油、汽油机油、车辆齿轮油、防冻液、通用锂基润滑脂、二硫化钼、白色特种脂、高温润滑脂、低温润滑脂、汽车制动液、车用尿素、天工抗磨液压油、极压锂基润滑脂、低温液压油
- 主营：机油、齿轮油、黄油、刹车油、液压油、切削液、防冻液
- 主营：防冻液、锂基脂、汽机油、刹车油、齿轮油、制动液、润滑油、润滑脂、方向机油、真空泵油、液压导轨油、抗磨液压油、工业防锈油、多效工具油、防锈乳化油、传动液压油、发动机冷却液、汽油机专用油、螺杆空压机油、手动变速箱油、机械润滑黄油、空气压缩机油、汽油发动机油、减速机专用脂、机床导轨油脂
- 主营：润滑油、润滑脂、液压油、制动液刹车油、齿轮油、工业油、防冻液
- 主营：导热油、机械油、汽油机油、DOT4刹车油、cf柴油机油、蜗轮蜗杆油、机床导轨油、工业齿轮油、电器绝缘油、车用润滑油、46号汽轮机油、ckc320号齿轮油、防锈汽轮机油、液压油、变压器油、液压支架乳化油、基础油、真空泵油、防锈油、淬火油
- 主营：美孚润滑油、壳牌工业油、长城工业齿轮油、美孚刹车油、道达尔润滑油、机油、柴油、汽油、润滑油、齿轮油、车辆齿轮油、车辆润滑油、全合成机油、汽车机油、低温抗磨液压油、车用齿轮油、合成汽车用油、轴承润滑脂
- 主营：刹车油、电缆盘
- 主营：储能液、导热液、防冻液、DOT4刹车油、冷却液、空气能循环液
- 主营：齿轮油、润滑油、防冻液、刹车油、汽机油、柴机油、变速箱油、抗磨液压油、液力传动油、hafele合成油、全合成机油、双离合波箱油
- 主营：led车库、切片刀、钓鱼竿、刹车油、矶钓线、鱼竿前、伸缩杆、去死皮、带醋碟、自发热、鱼竿后、海钓线、电子秤、晾衣杆、小锯子、调鞋码、增氧管、灌浆器、茶包袋、丝发热、气泡石、泡脚桶、复古线、调压阀、接水管、饺子盘
- 主营：龙头一、水龙头、出角阀、刹车油、开关控制、按钮开关、闪光蜂鸣器、带开关三通、铜角阀三通、二洗衣机龙头
- 主营：机械油、仪表油、锂基脂、长城DOT4制动液、航空油、液压油、蜗杆油、密封脂、阻尼脂、导轨油、传动油、齿轮油、润滑脂、乳化油、齿轮脂、全损耗、润滑油、轴承油、防锈油、冷却液、高温齿轮、抗磨液压、精密仪表、汽轮机油、压缩机油、真空泵油
- 主营：润滑脂、润滑油、液压油、汽车刹车油、齿轮油、轴承、防冻液、机械油、机械脂、上银滑块、柴油机油、冷冻机油、申舒斯水表、液力传动油、螺栓松动剂、真空泵油、发动机机油、合成制动液、除锈润滑剂、轨道黄油喷雾、化油器清洗剂、皂化油、泰洛锂基酯、过滤网
- 主营：10号航空液压油、2号防护油、65号冷却液、DOT4制动液、2号坦克润滑脂、4050航空润滑油、仪表脂、润滑油、真空脂、润滑脂、发动机、防锈油、冷却液、仪表油、齿轮脂、飞马2号、7254航空、密封脂、7502硅脂、68号低温、传动油、柴油机油、高低温脂、探伤载液、空压机油