This is the check valve. I removed these from my car when I installed disk brakes in the rear. Disk brakes don't need check valves.

When you get a chance, try taking them out and see if it helps.

 

20 hours ago, Jaymanbikes said:

I got another master installed it, shimmed it out, still same issue as the first go round, system is holding pressure. Here is what I have under the adaptor in the ZX master. 

 

2 hours ago, beermanpete said:

This is the check valve. I removed these from my car when I installed disk brakes in the rear. Disk brakes don't need check valves.

When you get a chance, try taking them out and see if it helps.

 

 

I will give it a rip when I get sometime to experiment, reinstall the master.  Weird the ZX master is designed for a car with Disc front brakes to the best of my knowledge.