VACUUM GIZMO--WHAT IS IT ???

[MIDNIGHT RIDER]

Located on the right fender of my 1985 F-350, just beside the ball-looking vacuum chamber, right behind the battery, is some kind of vacuum device.

A vacuum hose goes from it to the vacuum manifold on the fire-wall, just over the air-box.

There is a plug with three wires, bright red, dull red w/white stripe, and black.

This unit has a round plastic piece, about 3" diameter by 3/4" thick, with a round metal diaphragm?? the same size.

What purpose does this unit serve??

Is it a vacuum warning light sensor??

Thanks.

 

[82F100SWB]

This is the low vacuum switch. It operates the Brake light in the dash.

 

[oldmisterbill]

When it works it "operates the brake light in the dash" They don't seem to last a long time.

 

[MIDNIGHT RIDER]

I monitor vacuum with two gauges.

If that is all that thing does, it is bad in the way of progress, so I guess it will get surgically removed, or possibly relocated, if it still works; it would be cool to work the little red light on the trailer vacuum gauge.

Thanks.

 

[Freight_Train]

is this the hockey puck thing that is rattling around under the hood of the Enterpise?If so,will the brake light stay on if I disconnect it and use it as a trot line sinker?

 

[oldmisterbill]

You can use it for anything you desire.
However did you ever go into a toll both -step on the brakes only to find you have no vacum??
A gauge doesn't hit you in the eye to warn You of a problem.

PS - It is hard to pay a toll at 60 miles per hour. unless you want to see the
Mr Bill

 

[MIDNIGHT RIDER]

I un-hooked the vacuum line from this gizmo and let the truck idle.

No lights or buzzers or anything different, except that the gauge held at about 15 inches HG.

Obviuosly, this thing has just been going along for the ride, for the last several years.

It is in the way of progress, so it will now reside in one of my five-gallon buckets of stuff I don't throw away, forget what they are, and once in a million years, dig through and find something I can use.

Thanks for identifying this device for me.

 

[h2odrx]

so it will now reside in one of my five-gallon buckets of stuff I don't throw away, forget what they are, and once in a million years, dig through and find something I can use.

Thanks for identifying this device for me.

Man i thought i was the only one that did this??

 

[obinella]

It is hard to pay a toll at 60 miles per hour. unless you want to see the
Mr Bill

that's a great visual. how it going?