Brake master cylinder

It has to be going somewhere. If the engine is running, and you are loosing fluid, then it's the master has a leak and the fluid is getting sucked into the vacuum system, through the vacuum booster.

That is a common failure of a master as failures go but not on a new or a rebuilt one.

Best get on the horn with Wilkinson and ask him WTF.

May do that. But first I have to send back the rebuilt front calipers because THEY are leaking. Once I have the replacements that hold fluid, I plan on cracking the lines on the manifold on the floor of the trunk to see fluid coming out there, and then move down the line. Just got the M/C from Wilkinson. Engine is not running yet.

Call him FIRST. Tell him everything that is leaking and see if he will get those parts out the door first so that you can get finished.

Doesn't bode well for Wilkinson's impeccable reputation at all if you ask me.

Not really concerned about time line. Assuming the engine fires up (should), I'll be done in May. Already was told to send in the calipers FIRST. He was great about the rack as he said send the core in as soon as I could. Didn't charge a core fee. As for the MC, I want to make sure of what is happening first.