Anyone?, early/late brake pressure regulator Options

[altitude411]

So this came up in mepstein's classified ad http://www.914world.com/bbs2/index.php?showtopic=304055. What is the difference between the early and late brake pressure regulators? I PM'd Eric but I know he's busy and hasn't had a chance to respond as yet.
Anyone have an answer and better yet a photo of the differences? TIA

[JoeD]

I asked Eric about this a while back- my car ('73) was missing the regulator and I asked him if it mattered if I sourced an early or late to have rebuilt and installed.

Eric's answer:

"It really "does" matter. The left and right lines would have to change and the mounting studs would be in a different place as the later regulators were mounted closer to center.

Does it have a brass "T" fitting at the top of the pressure regulator? That's the one you need for your car.

Early models have one fluid inlet at the bottom and one at the top. The Brass T then distributes fluid from the top outlet to your left and right calipers.

Brass T's must have been expensive because, in late 1974 they drilled an additional hole in the rear of the regulator (at the top). The left calipers got fluid from the original top hole and the right caliper now got fluid from the new hole in the rear... effectively creating their own T at the valve body.

The rear hole can be plugged and the factory T installed on top of a late model regulator if need be so, all is not lost.

Hope that helps.

E."