Brake fluid is a type of hydraulic fluid used in hydraulic brake and hydraulic clutch applications in automobiles, motorcycles, and light trucks. It is used to transfer force into pressure and to amplify braking force. It works because liquids are not appreciably compressible.
Shell DOT 4 Brake and Clutch fluid is long-lasting and has a low viscosity. It is suitable, especially for anti-braking systems, electronic stability control systems and anti-skid systems. It provides extended service life and very good low temperature properties, especially required in anti-braking systems and electronic traction control. It meets and greatly exceeds the international set standards; SAE J1703 & J1704, FMVSS No.116 DOT 3 & DOT 4, & ISO 4925 Class 3 and 4. It exceeds the most stringent requirements of FMVSS No 116 DOT 5.1, regarding boiling temperature. Minimum boiling point of the unburned liquid = 170 ° C / 338 ° F. Shell Dot 4 Brake & Clutch Fluid exceeds the requirements from wet and dry equilibrium reflux boiling points (Wer ERBP and Dry ERBP) to help prevent vapor lock, resulting from boiling of the brake fluid under harsh condition such as racing. This offers superior resistance to boiling and associated vapor lock, compared to other DOT 4 brake fluids. Shell DOT 4 Brake and Clutch Fluid super protects internal components from under normal use and service.
Features of Our Shell Dot 4 Brake & Clutch Fluid
- Premium high performance and low viscosity brake and hydraulic clutch fluid.
- Provides protection for car parts, preventing them from corrosion and swelling.
- Very high boiling points of 230 °C dry Bp
- Meets strict standards and specifications set out by the Society of Automotive Engineers (SAE) and the Department of Transportation (DOT)
- Avoids water pooling in break system for better break performance.
Brake fluids must have these characteristics and meet certain quality standards for the braking system to work properly;
For reliable, consistent brake system operation, brake fluid must maintain a constant viscosity under a wide range of temperatures, including extreme cold. This is especially important in systems with an anti-lock braking system (ABS), traction control, and stability control (ESP), as these systems often use micro-valves and require very rapid activation. DOT 5.1 fluids are specified with low viscosity over a wide range of temperatures, although not all cars fitted with ABS or ESP specify DOT 5.1 brake fluid.
Brake fluid is subjected to very high temperatures, especially in the wheel cylinders of drum brakes and disk brake calipers. It must have a high boiling point to avoid vaporizing. This vaporization creates a problem because vapor is highly compressible relative to liquid, and therefore negates the hydraulic transfer of braking force, so the brakes will fail to stop the vehicle.
Quality standards refer to a brake fluid’s “dry” and “wet” boiling points. The wet boiling point, which is usually much lower (although above most normal service temperatures), refers to the fluid’s boiling point after absorbing a certain amount of moisture. This is several (single digit) percent, varying from formulation to formulation. Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic (water absorbing), which means they absorb moisture from the atmosphere under normal humidity levels. Non-hygroscopic fluids (e.g. silicone/DOT 5 and mineral oil based formulations), are hydrophobic, and can maintain an acceptable boiling point over the fluid’s service life.
Silicone based fluid is more compressible than glycol based fluid, leading to brakes with a spongy feeling. It can potentially suffer phase separation/water pooling and freezing/boiling in the system over time, the main reason single phase hygroscopic fluids are used.
Brake fluids must maintain a low level of compressibility, even with varying temperatures to accommodate different environmental conditions. This is important to ensure consistent brake pedal feel. As compressibility increases, more brake pedal travel is necessary for the same amount of brake caliper piston force.
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