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Motorbike brake fluid: which one to choose and when to change it
In the pursuit of better safety for your bike, there is a critical but often overlooked component: brake fluid. This vital fluid plays a vital role in the performance of the braking system, ensuring a fast and efficient response to any situation. However, the right choice of brake fluid and its proper maintenance are essential to ensure a safe ride. Today at SDT Brakes, we'll take note of the key considerations when selecting a brake fluid for your bike, as well as the signs that indicate when it's the crucial time to change it. Join us on this journey to safety on two wheels.
What is brake fluid for a motorbike?
Brake fluid for a motorbike is a crucial hydraulic component in the braking system that transmits force from the brake lever to the brakes, allowing the vehicle to decelerate or stop. This specialised fluid operates in a closed system and is noted for its unique properties, designed to withstand the extreme conditions of the braking system.
We will look at this in more depth later, but we can give a brief introduction to the types of brake fluids that exist, the most common being those classified as DOT (Department of Transportation) and ISO specification. DOT fluids are typically used in vehicles manufactured in North America, while ISO specification fluids are more common in European vehicles and some Japanese motorbikes.
Similarly, brake fluid is generally polyethylene or polypropylene based glycol and is formulated to have a high boiling point, as it operates under conditions of extreme heat generated by friction during braking. In addition, it must be hygroscopic, meaning that it has the ability to absorb moisture from the air to prevent the formation of vapour bubbles in the braking system, which could compromise braking efficiency.
In summary, brake fluid for a motorbike is a specialised hydraulic fluid that transmits the force generated when the brake is applied to the brake components, ensuring a fast and efficient response from the braking system. Its correct selection and maintenance are essential to ensure optimum brake system performance and hence rider safety.
Type of brake fluid for motorbikes
There are several types of motorbike brake fluids, and the choice of the correct type depends on the specifications of the motorbike manufacturer and the brake system used. The two main types of brake fluid commonly used on motorbikes are DOT (Department of Transportation) specification brake fluid and ISO (International Organization for Standardization) specification fluid.
DOT 3, DOT 4, DOT 5, and DOT 5.1:
These specifications are set by the U.S. Department of Transportation and are common on motorbikes manufactured in North America. DOT 3, DOT 4 and DOT 5.1 fluids are glycol based and are hygroscopic (moisture absorbing). DOT 5, on the other hand, is silicone based and non-hygroscopic. DOT 5 fluids do not mix well with DOT 3, DOT 4 or DOT 5.1 fluids, and are generally not recommended for conventional brake systems.
ISO 4925:
That is, this is a standard set by ISO and is common on motorbikes manufactured in Europe and some Japanese motorbikes. Like DOT fluids, ISO specification brake fluids are glycol based.
It is also essential to follow the motorbike manufacturer's recommendations and use the specific type of brake fluid listed in the owner's manual. Incorrectly mixed brake fluids can adversely affect brake system performance and compromise safety.
Also, be aware of the boiling point of the brake fluid, as higher quality fluids tend to have higher boiling points, which is beneficial under heavy braking conditions.
It is always advisable to check your bike's owner's manual and, if in doubt, seek the guidance of a professional mechanic to ensure you use the correct type and keep your brake system in optimum condition.
Which brands are the most recommended for your bike?
ATE:
ATE is a recognised brand in the world of brake fluids and is commonly used in European vehicles. It offers high quality brake fluids that comply with standard regulations.
Bosch:
Bosch is a well-known brand in the automotive industry and also manufactures brake fluids. Its products generally meet quality and safety standards.
Motul:
Motul is a popular brand in the field of engine and brake system products. It offers high performance brake fluids.
Castrol:
Castrol is another well-known brand that produces a variety of lubricants and vehicle fluids, including brake fluids.
Valvoline:
Valvoline is a global brand that also produces high quality brake fluids used in a variety of vehicles.
SDT:
Our flagship brand is coming on strong and is looking to position itself as one of the preferred and reliable brands in the market. As we can see, SDT RT313 racing brake fluid has been specially formulated and developed to provide outstanding performance in trackday or speed racing conditions, where braking systems must operate at very high temperatures.
It is important to note that brand popularity may change over time and product availability may vary by region and local market. Also, when choosing a brand, be sure to check your motorbike manufacturer's specifications and recommendations from industry professionals to ensure proper compatibility and performance.
When to change your brake fluid?
The interval for changing a motorbike's brake fluid can vary depending on the manufacturer's recommendations, the type of brake fluid used and riding conditions. However, here are some general guidelines you can follow:
Time and mileage.
Even if you haven't ridden much, it is recommended that you change your brake fluid every two years. This is because brake fluid tends to absorb moisture from the air over time, which can affect its boiling point and effectiveness.
On the other hand, while time is an important factor, some manufacturers also suggest changing the brake fluid after a certain mileage. You can find this information in your bike's owner's manual.
Riding conditions and visual inspection
If you ride in more demanding conditions, such as extremely hot weather or mountainous terrain, you may need to change your brake fluid more frequently. Intense driving conditions can increase the temperature of the fluid and accelerate its degradation.
In addition, you can perform a visual inspection of the brake fluid. If it appears cloudy or dark in colour, it could be a sign of contamination and may need to be changed before the recommended time interval.
Bleeding from the system
If you have performed maintenance work on the brake system, such as replacing a caliper or hose, it is good practice to bleed the system and change the brake fluid to ensure that any air bubbles are removed.
In conclusion, remember that brake fluid is crucial for the safe operation of the braking system. If you have questions or need specific advice for your motorcycle, it is always advisable to consult the manufacturer's manual or seek the guidance of a professional mechanic.