Brake fluid can get hot due to the heat generated during the braking process. When you apply the brakes, the brake pads or shoes create friction against the rotors or drums, converting the kinetic energy of the moving motorcycle into heat energy. This heat is transferred to the brake components, including the brake fluid.
The high temperatures can affect braking performance in several ways:
Brake Fade: Excessive heat can cause brake fade, which is a loss of braking power. As the brake fluid gets hotter, it can start to boil or vaporize, forming gas bubbles within the brake system. These gas bubbles compress more easily than the brake fluid, resulting in a spongy feeling when you apply the brakes and a decrease in stopping power.
Brake Fluid Degradation: High temperatures can also cause brake fluid to degrade over time. Brake fluid is designed to have a high boiling point to withstand normal operating conditions. However, sustained exposure to extreme heat can cause the fluid to break down, leading to a decrease in its ability to transmit hydraulic pressure effectively. This can result in reduced brake responsiveness and a softer brake pedal feel.
Brake System Damage: Prolonged exposure to high temperatures can also damage various brake system components. The heat can lead to the expansion of brake lines, seals, and other parts, potentially causing leaks or failures in the system. Overheated brake rotors or drums can warp or develop cracks, compromising their performance and safety.
To mitigate the effects of heat on brake fluid and braking performance, it's essential to use brake fluids with high boiling points, suited for the specific demands of your motorcycle. Regularly inspecting and replacing the brake fluid as recommended by the manufacturer helps maintain its effectiveness.
Additionally, riding techniques that minimize the need for heavy and prolonged braking, such as anticipating traffic and applying smooth, controlled braking, can help manage heat buildup in the braking system. Adequate ventilation and airflow around the brakes can also aid in dissipating heat efficiently.