ed t, the machine in discussion has the oem prk brk mech in place +in working order. mico brake is the vendor of the master cyl in question. it is conventional in appearence, but is a 2 stage volume unit. the 1st stage sets the pucks and inching cyl, using very little pedal travel, 2nd stage is small volume with light pedal effort. when working,best of both worlds. in this case, every 2 yrs or so, the master holds a residual press necessitating replacement. question stands, has any one else run into this? what say you? mike aloris