Which tool is commonly used to measure brake fluid quality?

The most appropriate tool for measuring brake fluid quality is a brake fluid tester. This specialized device is designed to assess the condition of brake fluid by measuring important factors such as moisture content and boiling point. Brake fluid can absorb moisture from the atmosphere, which can degrade its performance and lead to potential brake failure. A brake fluid tester allows mechanics to ensure the brake fluid is at an acceptable level of quality, thereby maintaining vehicle safety and performance.

In contrast, a torque wrench is utilized for applying a specific torque to fasteners, which is essential but not related to fluid quality. Brake cleaners are used for cleaning brake components but do not assess fluid quality. A socket wrench is a general tool for tightening or loosening nuts and bolts, also unrelated to measuring fluids. Therefore, the brake fluid tester stands out as the tool specifically designed for evaluating the quality of brake fluid.