I'm not a pro but I'd say this is not normal. I recall don't recall another post here concerning cracks in the cap. Someone will be along shortly more knowledgeable and can give you better advice.
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Pete & Joan & "Honey" fur-baby.
2015 Montana 3611RL 2012 F350 6.7 DRW Lariat
Disc Brakes & Sailun 14 ply S637
6-pt Hydraulic leveling
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