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What’s is this???

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Old 04-15-2018, 07:34 PM
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I have a 88 lariat, and would like to know what this component is which is next to brake booster. It looks like a vacuum pump, but not sure. What is it, and what does it do???
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Old 04-15-2018, 07:40 PM
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Cruise control servo?
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Old 04-15-2018, 09:09 PM
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I guess it’s of no use now considering I have done a efi to carb conversion
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Old 04-16-2018, 10:16 AM
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Yes, many carb vehicles have cruise control, and that servo was used from the late 70s until '92 (on F-series).


(phone app link)
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Old 04-16-2018, 11:42 AM
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I was looking at it yesterday. Just looks like it needs hooking back up to vacuum port, and keep the cable piggybacked on throttle cable. I did notice the original vacuum can at front had originally imploded, sucked itself in, so must of had an original problem
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Old 04-16-2018, 10:32 PM
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There is no cruise problem that could cause the vacuum reservoir to collapse. It gets full manifold vacuum all the time. Either it rusted in a very even way so that it became too weak, or something mechanically crushed it (like something stowed under the hood, or a collision).
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Old 04-17-2018, 06:45 AM
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Thanks guys, think I have it sorted now
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