Discussion
Which purpose did cross drilling of discs originally serve?
Answer: C
Early linings outgassed heavily and the holes let the gas escape rather than forming a layer between the pad and the disc. Modern materials do not need it. The holes now serve mainly to initiate fatigue cracks. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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