Discussion
Which problem does gas pressurisation prevent in a damper?
Answer: A
Without pressure the oil cavitates behind the piston at high velocity, forming bubbles that collapse and destroy the damping. Nitrogen at high pressure suppresses it. The symptom is a damper that works when cold and fades on a rough road. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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