Question on Parking Brake Adjusting

-- Please note - Hand brake lever travel was fine before job commencment .
Replaced a genuine rear brake caliper and new brake pads , on a 2007 cooper , due a seized piston . System bled from air . As always , I wound fully the pistons as far as they go in and tightened all home .
Started engine, pumped brake pedal a couple of times to get the pistons close in on the rotors and get the designed clearance as is normal practice.
However somehow the new genuine caliper would not hold on handbrake operation and lever travel increased considerable .
Only after fiddling several times winding " out and in " the piston , I managed to get acceptable operation.
The system is bonkers as I heard several issues with this system ,
I plan to dismantle a caliper to somehow try to understand why such a silly hydroumechanical system is not designed like other systems as used by other manufecturers / systems .
The caliper , system is from " TRW "
Stupid arrangement
and thanks for your articles Plican

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This post was auto-generated based upon a question asked on our tech article page here: MINI Cooper R56 Parking Brake Adjustment (2007-2011) | Pelican Parts DIY Maintenance Article

[Nick at Pelican Parts]

It is a rotating ramp inside that allows adjustment with wear. Wonder if the new one was jammed? Thanks for sharing your experience.

- Nick