How to remove brake proportioning valve?

[Makebeleaf]

96 Golf TD

I went to the wrecker and found a couple of these valves on the old cars. I need a new one for mine (Leaking fluid).
They look like they are in good shape but I can't get them off. Rusty bolts. Anyone have a way to get them off? Should I be turning the 2 Allen key bolts?
They look as though they run straight through the Aluminum body and into the bracket of the car.

I started on the allen bolts and my allen key just chewed the heads up....they weren't going to turn.
I believe there is only the 2 allens and then the bottom bolt(13mm?) to remove the valve.

Why is it so hard to remove?

[macka]

you need to soak the bolts with penetration fluid. The other option is to use a broken bolt extractor and that's hit and miss too.

[Makebeleaf]

So I do need to remove the 2 allen head bolts to get it off?

[macka]

yep AFAIK they go through the square body and into the bracket. You have a non ABS model?

[Makebeleaf]

Yes...non ABS....I wonder If I go to a wrecker and take a reciprocating saw and cut off the bracket that it is attached to?
Then I can work on it when I get it home.