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Message: [QUOTE="Iso-baric, post: 1548911, member: 32327"] Failure modes in order of frequency with which I've encountered them: -Vacuum line running from wheel well to knuckle. They are exposed to all sorts of environmental and road hazards. In this location it is also susceptible to mechanical failure from articulation of the front axle (in this respect I think Dodge's split D60 with a single vacuum line near the centerline of vehicle is superior). -Vacuum solenoid. -Hub o-rings failing due to age/heat/contaminants. -Hub itself developing stiction due to lack of frequent use. A momentary pulse of vacuum is applied to engage/disengage the hubs, not continuous vacuum as most think. If this pulse can't overcome whatever resistance exists within the hub, they will stay in their current position. -Low vacuum pressure. I believe it is 7.5psi to engage and 3.75psi to disengage. There isn't much on these trucks that uses vacuum, so make sure your pump is healthy. [/QUOTE]

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