Motul's 100% synthetic brake fluid is designed for all hydraulic actuated brake and clutch systems in accordance with DOT 5.1, DOT 4, and DOT 3 manufacturers recommendations. This is a premium street performance and track-day brake fluid that is optimized to work effectively with ABS systems. Dry boiling point is 522°F (272°C).
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What is the recommended change interval for brake fluid? For a road car the fluid should be flushed every 2 years. Brake fluid is hygroscopic meaning that it readily absorbs water from the atmosphere. The fluid's boiling point is reduced as the water content increases, thus one of the reasons for changing the fluid. A track or rally application should do this more frequently. The exact frequency will really depend on the fluid temperatures. Fluid that has boiled or been subject to extreme temperatures should be replaced as soon as possible.
What does the DOT rating mean? DOT 3,4, and 5.1 are all polyethylene glycol fluids. The specific DOT rating indicates the minimum boiling temperature of the fluid. The higher the rating the higher the minimum boiling temperature. DOT 5.1 has a minimum dry boiling point of 270°C. Do not confuse DOT 5 which is a silicone based fluid with DOT 5.1 as the two fluids are not compatible and cannot be mixed.
What makes a brake fluid more compatible with the ABS system? Motul DOT 5.1 has viscosity and compressability characteristics that make it ideal for ABS systems. Optimum ABS performance depends on the precise movement of fluid through the valve body and this can be affected by the characteristics of the fluid.
Can RBF fluids be used in high performance road cars? Absolutely.
How do I flush and bleed the brake system? With a bleeder bottle attached open the bleeder valves one at a time starting at the corner farthest from the master cylinder and ending at the closest. Slowly pump the brake pedal to push the fluid through the system. Do not allow the fluid level in the master cylinder to run dry. Once the fluid runs clear close the valve and move to the next brake caliper. When all corners have been done go back through them again but this time pump the brake pedal 4 or 5 times with the valve closed and hold pressure on the pedal. Open the bleeder valve and watch the fluid moving through the clear tubing for air bubbles. When the fluid stops flowing close the bleeder valve and release the pressure on the brake pedal. If there are any bubbles present in the fluid continue this process. When all air is removed from the caliper go to the next corner. On calipers with multiple bleeder valves bleed each one separately starting with the inside one.
