Why should brake fluid be stored only in a sealed container?

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Multiple Choice

Why should brake fluid be stored only in a sealed container?

Brake fluid is hygroscopic, meaning it readily absorbs moisture from the air. If it isn’t kept in a sealed container, water from the surrounding air enters the fluid, lowering its boiling point and increasing the risk of vapor lock under heavy braking. Water in the fluid also promotes internal corrosion of brake components and reduces braking performance. Sealing the container prevents moisture uptake, keeping the fluid's properties stable. The other ideas—evaporation, corrosion of the container, or freezing—are not the primary reason for storage in a sealed container.

Brake fluid is hygroscopic, meaning it readily absorbs moisture from the air. If it isn’t kept in a sealed container, water from the surrounding air enters the fluid, lowering its boiling point and increasing the risk of vapor lock under heavy braking. Water in the fluid also promotes internal corrosion of brake components and reduces braking performance. Sealing the container prevents moisture uptake, keeping the fluid's properties stable. The other ideas—evaporation, corrosion of the container, or freezing—are not the primary reason for storage in a sealed container.

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