Discussion
Which component prevents grease escaping from the inner end of a hub?
Answer: B
A lip seal running on a machined surface retains the grease and excludes contamination at the inner end. The dust cap does the same job at the outer end. A leaking inner seal contaminates the brake and is a safety defect. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape.
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