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Difficulty: MediumInferring Author Purpose and Intent

Unlike conventional automotive fluids that lubricate moving mechanical components, hydraulic brake fluid functions as an incompressible medium designed to transmit pedal force directly to the calipers. However, glycol-based brake fluids are hygroscopic, meaning they steadily absorb ambient moisture through microscopic pores in flexible rubber brake lines and master cylinder seals over time. Even a three percent water accumulation can depress the fluid's boiling point by more than one hundred degrees. Under prolonged or aggressive braking, the localized heat generated at the friction pads can boil this contaminated fluid, producing compressible steam pockets that lead to total pedal failure, known as vapor lock. Regular fluid replacement is therefore essential to preserve hydraulic integrity.

Which of the following best describes the author's primary purpose in this passage?

  1. A
    To detail how brake calipers convert mechanical pedal force into stopping friction
  2. To explain the risks of moisture absorption in brake fluid and highlight the importance of routine maintenanceAnswer
  3. C
    To urge vehicle manufacturers to eliminate flexible rubber brake hoses across all modern vehicles
  4. D
    To prove that brake pedal failure occurs primarily as a result of reckless driving habits

Answer

To explain the risks of moisture absorption in brake fluid and highlight the importance of routine maintenance
The passage explains the physical process by which glycol brake fluid absorbs moisture and causes vapor lock, leading directly to the author's main takeaway that regular fluid replacement is essential to maintain safety.

Step-by-Step Solution

1
Analyze the passage structure and identify the core problem being presented.
The text explains that hygroscopic brake fluid absorbs water, drastically lowering its boiling point and causing vapor lock under braking heat.
Understanding the central technical subject helps differentiate the primary focus from supporting context.
2
Examine the concluding sentence to determine the author's key takeaway or objective.
The author states that 'Regular fluid replacement is therefore essential to preserve hydraulic integrity.'
The concluding statement directly articulates the practical motivation behind explaining the degradation process.
3
Synthesize the problem and conclusion to determine the author's primary intent.
The passage is designed to explain how water contamination compromises braking systems and why preventative fluid changes are necessary.
The primary purpose must encompass both the informative explanation of the hazard and the recommended maintenance solution.

Key Concept

Inferring Author Purpose and Intent in Technical Texts
Estimated Time:1m 0s
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Inferring Author Purpose and Intent

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