Just a reminder, if you switch to a dual MC you must redo the lines!
The stock single-pumper has the left front wheel on it's own line, and the remaining wheels connected by brass metering blocks. Dual-stage masters require the front wheels share one output, the rears share the other.
When my dual+power unit arrived, I crawled around under the truck w/ a tapemeasure and mapped out how I wanted the lines routed. Then I got specific lengths of line with preformed ends and connectors attached. Assembled w/ flare nut wrenches, filled, tightened, pressurized, tightened, bled. Entire brake system took a weekend to install, hasn't leaked in 3 years.
If you're keeping the one-shot MC, rebuild it. Mine was working perfectly and 15 seconds later it was toast. 5 seconds later so was my bumper, fender, and all faith in single-stage master cylinders.
