I have a new one still not installed.
Just looked at it now. The centre part doesn't move inwards
but it does move rotationally and does move slightly outwards.
My theory is that it needs a fluid pressure within it to operate in
an 'out' direction. And that outwards direction is regulated
by the position of the arm connected to it. The arm, being related to
the 'lift' of the car on braking, will allow less pressure upon rear lift.
Conversely, in its present state, like mine is, it would allow full pressure to flow.
Or vice versa.
Nigel
