Car brake fluid and motorcycle brake fluid are not interchangeable. Car brake fluid is typically DOT 3 or DOT 4, while motorcycle brake fluid is DOT 4 or DOT 5. DOT 5 brake fluid is not compatible with DOT 3 or DOT 4 brake fluid, and mixing the two can cause serious damage to your motorcycle's braking system.
DOT 5 brake fluid is silicone-based, while DOT 3 and DOT 4 brake fluids are glycol-based. Silicone-based brake fluid does not absorb water from the atmosphere like glycol-based brake fluid, so it does not need to be changed as often. However, silicone-based brake fluid is also more compressible than glycol-based brake fluid, so it can lead to a spongy brake feel.
For these reasons, it is important to use the correct type of brake fluid in your motorcycle. Using the wrong type of brake fluid can cause serious damage to your motorcycle's braking system and could lead to an accident.
