Master cylinder residual pressure valve

Murray said
No residual check valves on disc brakes, otherwise they won't release.

I think most know that but the OP was specifically asking about the presence of a RPV.

Bewy said
In later years, some companies deleted the RPV, found it wasn't necessary.

I read that too but didn’t know if it applies. I thought someone might know but, I guess I’ll cut one open to find out.

Thanks Folks!