To select the appropriate brake fluid for a motorcycle, it is essential to check the users’ manual and verify the specified fluid.
While DOT 4 is commonly required, this is not universally applicable.
Although commonly referred to as "brake oil", the correct term is brake fluid. While it does offer some lubricating properties, its primary function is to transmit hydraulic pressure to the braking system while withstanding high temperatures and reacting minimally to water contamination.
It is crucial that neither the brake fluid nor any absorbed moisture reaches boiling point during operation, as this could lead to vapor lock, resulting in a spongy brake feel or complete brake failure.
One of the key performance parameters is the Equilibrium Reflux Boiling Point (ERBP), which should be checked on technical data sheet.
Brake fluid chemistry is fundamentally different from that of mineral or synthetic oils used in other vehicle systems, and the fluids are neither miscible nor interchangeable. Therefore, it is imperative to adhere strictly to the manufacturer's guidelines.
For modern motorcycles (and cars) equipped with electronic systems such as ABS and traction control, DOT 4 or DOT 4 LV (Low Viscosity, e.g., Pakelo 4132.00) is typically recommended.
