How to Determine If Brake Fluid Needs Replacement

[McHaley]

To determine if brake fluid needs replacement, check its water content. If the water content reaches 3%, the brake fluid should be replaced immediately. When brake fluid absorbs a certain amount of water, its boiling point decreases because water has a lower boiling point. During braking, the heat generated can cause the brake fluid to heat up. If the brake fluid contains water, it may boil and vaporize, leading to vapor lock and reduced braking performance. Brake fluid, also known as hydraulic brake fluid, can be tested for water content using a moisture detection pen available at 4S shops. Simply insert the pen into the brake fluid reservoir to check the water content. If a moisture detection pen is not available, it is recommended to replace the brake fluid every 2 years.