What should be inspected during a brake fluid replacement?

During a brake fluid replacement, it is essential to inspect the condition of brake lines and the functionality of the master cylinder. The reason for this focus is that brake fluid is hydroscopic, meaning it absorbs moisture over time, which can lead to a decrease in braking performance and potential damage to the brake system components.

Inspecting the brake lines ensures that there are no leaks or weaknesses that could compromise the braking system. If any lines are corroded or cracked, they should be replaced to maintain safe braking capabilities. The master cylinder's functionality is also critical, as it is responsible for generating the hydraulic pressure needed for the brake system to operate effectively. Any failure in the master cylinder can lead to a complete loss of braking function, making it vital to confirm that it operates properly during brake fluid replacement.

Other elements, while important for overall vehicle maintenance, do not directly relate to the immediate requirements of a brake fluid replacement. For instance, the color of the brake pads does not impact the fluid's condition, alignment of the wheels is not relevant to the brake fluid system, and knowing the mileage is less critical compared to the immediate safety concerns related to the brake lines and the master cylinder.