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

[Eric_Shea]

Here's the skinny, and, think "economies of scale"

Early pressure regulators had a fluid inlet at the bottom and a fluid outlet at the top. A single inlet was fine but, the outlet now needed to go to the left and the right sides of the car. A brass "T" fitting with a banjo bolt was employed to do the job.

The valve had always been bossed for multiple outlets but, only the one at the top had been tapped to 10x1. In Garold's picture above you can see the boss on the early regulator on the left (circled in green).

Later pressure regulators were simply tapped on the top "and" now the back side facing the firewall. The right side line went into the back and the left side went directly into the top. This did away with the more expensive components (brass T fitting, banjo bolt and copper washers). You can see the later one with the same boss tapped to 10x1 on the right (circled in red). Eliminating the T was a cost saving measure.



So... the down and dirty; early ones have the brass T, later ones do not. If your pressure regulator is missing you can tell by the VIN or, by your lines. Early ones have straight line ends that go directly into the T. Later ones have 90 degree bends at the end of the lines.