Unknown plug or end cap maybe?

[Riggleman]

Think it's made of aluminum. But it does seem too heavy to be aluminum. The yellow color seems to be worn to silver in some places. Found 5 or so inches down. Gave 70ish reading.

 

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[Back-of-the-boat]

Makes me think of a freeze plug, but strange looking if so.

 

[can]

fence pole cap

 

[repete]

That would be a one of the plungers for a brake wheel cyl. on a car.

 

[QUICKSILVER (appletree)]

nice ID repete! I recognized it right away! Automotive Drum brake wheel cylinder piston.

 

[Riggleman]

Makes since was found in the center of an old road. Thanks guys.

 

[QUICKSILVER (appletree)]

Your welcome

 

[Anduril]

That would be a one of the plungers for a brake wheel cyl. on a car.

Sounds right, but I thought pistons for caliper brake systems have a groove to seat a hydraulic seal or boot.
I don't see one in the photo. (?)

Anyway, if it was found on the road, then it must be a Ford part.
Assuming the "Duck & Cover" position now.

Truthfully, I did drive some mechanically questionable Ford's in my college days....

 

[Riggleman]

Yeah I drive dodge so I never have to work on my truck so couldn't tell either lol

 

[QUICKSILVER (appletree)]

Not disc brakes!!!! Drum brakes

 

[QUICKSILVER (appletree)]

Ford part? All makes with drum brakes have those!

 

[QUICKSILVER (appletree)]

Its Number 2 in the diagram

 

[Anduril]

Oh! (Thanks).
I guess the 28mm dimension provided in the initial post rules out disc calipers! Duh!

The Ford comment was more of a joke, poking fun that Ford trucks fall apart as you drive them.
Or at least mine did. Come to think of it, the driving part was optional.

 

[cudamark]

Yup, wheel cylinder piston. If it's 28mm in diameter, it's probably off a truck.