This document describes how to rebuild the D0OZ-2B257-B Wagner brake pressure differential valve by replacing the internal parts that typically wear out after years of service. Tools needed:

This document describes how to replace the electronic circuit board found in a 1969, 1970, and 1971 Ford electronic engine governor (also called a rev limiter) with a modern circuit board manufactured by Pertronix and installed in their digital rev limiter product. The project requires disassembly of both limiters and modification of the Pertronix circuit board to work inside the Ford case. Basic soldering skills are required.

This document describes how to rebuild the D0OZ-2B257-C Kelsey-Hayes brake pressure differential valve by replacing the internal parts that typically wear out after years of service. Tools needed:

This document describes how to rebuild the Wagner brake pressure differential valve (sometimes called a "distribution block") and front disk brake pressure control valve (sometimes called a "proportioning valve") used on Ford and Lincoln/Mercury vehicles by replacing the internal parts that typically wear out after years of service. Tools needed: