What is checked to determine brake fluid quality?

To assess the quality of brake fluid, using a brake fluid tester is essential. This tool measures the moisture content in the brake fluid, which is crucial because brake fluid can absorb moisture over time. Excessive moisture can lower the boiling point of the fluid, increasing the risk of brake fade and decreasing braking performance.

A brake fluid tester typically provides a quick visual indicator of fluid quality by detecting the presence of water and indicating if the fluid has degraded beyond acceptable thresholds. This testing is important for maintaining optimal braking efficiency and ensuring safety.

In contrast, the other options serve different purposes. A hydraulic pressure gauge measures the pressure in the brake system but does not provide insights into the fluid's condition. A fluid level indicator may indicate how much brake fluid is present, but it does not assess its quality. Lastly, a brake pad thickness gauge measures the wear on the brake pads rather than the quality of the fluid. Therefore, utilizing a brake fluid tester is the appropriate method for checking brake fluid quality.