Which of the following should be avoided when dealing with brake fluid?

Mixing different types of brake fluid should be avoided because different brake fluid types have varying chemical compositions and properties. For example, brake fluids can be categorized mainly into DOT 3, DOT 4, and DOT 5, each with distinct characteristics, such as boiling points and moisture absorption. Mixing these fluids can lead to reduced performance, inadequate lubrication, corrosion, or even brake failure. The compatibility issues may result in chemical reactions that can compromise the brake system's seals and components, ultimately jeopardizing safety.

Using clean containers for storage, inspecting for leaks, and wearing protective gear are all important practices when handling brake fluid. Keeping brake fluid in clean containers prevents contamination, routinely inspecting for leaks ensures that the brake system operates effectively, and wearing protective gear shields the technician from potential chemical burns or harm caused by brake fluid spills. Thus, the practice of avoiding the mixing of different types of brake fluid is critical for maintaining the integrity and safety of the braking system.