Which statement is true regarding brake system repairs and hydraulic fluid?

In brake system repairs, it is crucial to maintain the integrity and effectiveness of the hydraulic fluid used in the system. Contaminated fluid should be replaced because it can significantly affect the performance and safety of the brake system. Brake fluid can absorb moisture over time, which can lead to corrosion within the brake components and a decrease in the boiling point of the fluid, resulting in brake fade during high-temperature conditions. Additionally, contaminants like dirt, rubber particles from deteriorating seals, or other fluids can compromise the hydraulic action necessary for reliable braking.

Regularly inspecting and servicing the brake fluid ensures that it remains clean and effective, thus optimizing the vehicle's braking performance and enhancing safety. This proactive approach prevents potential failures that could arise from using compromised brake fluid, reinforcing the importance of replacing contaminated fluid during brake system maintenance.