99 ford ranger 4x4 problems

1999 FORD RANGER
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MUDRANGER
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my truck disengages four wheel after a few minutes of use but if i take it out then put it back in it works for a fe mins again does any one no what the problem could be? i have been told that there is a problem in my vacum system but i would like to find out what i can be fore i replace the vacum switchs

99 ford ranger 3.0l 4x4 100,000mi
May 1, 2007 at 8:26 PM
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SERVICE WRITER
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I had leaks out at the front wheels where the rubber vacuum line meets the metal, I cleaned it up and reattached it with a real light smearing of silicone and it was fine.
May 1, 2007 at 8:47 PM
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MUDRANGER
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i have done that already that was my first problem but they just wont stay locked
May 2, 2007 at 8:03 PM
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