Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Brake fluid that has a low boiling point can be repaired by:

Brake fluid is hygroscopic, meaning it absorbs moisture from the air and from the system over time. As water content increases, the fluid’s boiling point drops. Under heavy braking, the fluid can start to boil, creating vapor in the hydraulic lines and causing brake fade or loss of braking power. The reliable fix is to replace the old fluid with fresh fluid of the correct DOT specification by flushing the system. This removes the moisture and contaminants, restoring the fluid’s high boiling point and better braking performance. Simply adding more fluid doesn’t remove the moisture already present, and heating the fluid would just promote boiling rather than fix the issue. Replacing with a different type of fluid isn’t correct because the system requires a specific DOT grade and mixing fluids can cause compatibility problems.

Brake fluid is hygroscopic, meaning it absorbs moisture from the air and from the system over time. As water content increases, the fluid’s boiling point drops. Under heavy braking, the fluid can start to boil, creating vapor in the hydraulic lines and causing brake fade or loss of braking power. The reliable fix is to replace the old fluid with fresh fluid of the correct DOT specification by flushing the system. This removes the moisture and contaminants, restoring the fluid’s high boiling point and better braking performance. Simply adding more fluid doesn’t remove the moisture already present, and heating the fluid would just promote boiling rather than fix the issue. Replacing with a different type of fluid isn’t correct because the system requires a specific DOT grade and mixing fluids can cause compatibility problems.