Something I've found with the remanufactured MC's is that they usually replace the original reservoir with a Chinese one which works out nice because they have the magnetic float inside of it so you can add a low fluid switch to that D-shaped hole on the bottom center of the reservoir. The original US made reservoirs only had the float switch on the larger reservoirs and never on these shorter ones. Try tipping the unit upside down and see if you can hear anything move, if you can it probably is the reservoir's float! Below are some pictures of reservoirs with the switch.I've been working indoors these last few days with the cold weather we're having. I'm starting to bend the new brake lines for around the MC and airpacks.
I have 2 axle ends left and a bunch of tires to change, I'm slowly breaking them down and cleaning up the rims.
I found a reference in a brake thread to a new make dual master cylinder since I couldn't find NOS version. A big bonus is the price; $119 + core charge
Differences that I've found are the top embossing and the port sizes though a quick trip to my local brake supply shop hooked me up. I am remaking all my lines using 7/16's fittings so the adapter I bought won't work for the standard Air Force model. You may be able to find an adapter for the stock fittings but you'll likely have to replace those lines anyways because the adapters will change the line geometry.
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