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← ScienceWhich mechanism causes decreased braking effectiveness in a car's disc brake system after prolonged downhill driving?
A)Hydraulic fluid vaporization
B)Brake pad glazing✓
C)Rotor warping
D)Master cylinder failure
💡 Explanation
When brakes are used continuously downhill, brake pad glazing occurs because excessive heat causes the resin in the brake pads to melt and form a smooth, friction-reducing layer on the pad surface. Therefore, pad glazing results, rather than fluid vaporization, rotor warping, or master cylinder failure, which require different triggering events.
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