when is a brake fluid flush recommended

Hello, as a matter of reference in the automotive industry, some manufacturers suggest every 2 years, some suggest every 3 years. The reason is -- brake fluid attracts moisture naturally from the atmosphere, and moisture in your brake fluid is bad for all brake components, not to mention maintaining proper brake fluid temperature. It can overheat and cause braking problems if there is too much moisture in the fluid. So, preventive maintenance of replacing your fluid every 2-3 years is highly encouraged. Hope this helps!

Brake fluid can be *tested* to provide information regarding your concern. Sometimes a visual inspection is all that's needed.