Question about Ford Windstar

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Windstar 2000 no vac at the booster-have great vac at the carb. just have regular brakes , no power brakes. don't believe to have a leak or at least one that I can hear engine runs fine

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  • daveandoneit Dec 13, 2009

    thanks. kind of did that. there is a throttle by pass valve ( part# e7839c915ca) mounted on the fire wall that the vacuum passes through with voltage.tested and has 12v. is there a way to test that to see if this could be the problem? going out and check other little line that go to this item and back to the plenum. THANKS



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Check vacum at brake booster if you have vacum there bad brake booster, if you don't follow vacum line check there, vacum line should go to intake, if you do have vacum replace vacum hose.

Posted on Dec 13, 2009


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Brakes on 96 cheverolet go to floor on start up

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When you say airbrakes, do you mean that the vehicle has airbrakes, or does it have hydraulic brakes with a vacuum brake booster? As far as replacing it with a 12v vac pump, there might be some DOT regulations prohibiting this as it involves safety issues. If one has the vac booster, it is leaking brake fluid and not oil. The hydrovac booster will leak either as it uses power steering fluid from the P/S pump to do the job.

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