No bleeding necessary from these Chris. It's all done automatically - but after any depressurising / drain / re-fill / Re-pressurising, the bleeding is done just by setting to lowest suspension level, and slow turning of the wheel lock to lock 8-10 times without holding at either stop. Then check fluid is between marks and no bubbles / repeat procedure if necessary, then return to normal height.
Here's a simple diagram of the rear firmness regulator:
Soft Status
"A": High pressure inlet (Integrated BHI ).
"B": Return to the reservoir (Integrated BHI ).
(1) Rear firmness regulator.
(2) Rear stiffener regulator accumulator.
"a" Variable firmness electrovalve.
"b" bleed screw(s) .
"c" Hydraulic isolation slide valve.
"d" Electrovalve slide valve.
Soft status:
- The electrovalve is not supplied
- The electrovalve slide valve "d" moves under the effect of the integrated hydroelectronic block supply pressure
- The return to the hydraulic fluid reservoir is blocked: The pressure under the lower part of the hydraulic isolation slide valve is identical to that of the BHI
- The upper part of the hydraulic isolation slide valve is identical to that of the BHI: The slide ("c") moves under the action of the integral spring
- Flow of hydraulic fluid between the right hand and left hand suspension is possible: The hydractive 3+ sphere communicates with the suspension circuit
N.B.: In the rest position, the rear firmness regulator is at the soft status.
N.B.: The body height can be regulated in "soft status" operation.
Firm Status
"A": High pressure inlet (Integrated BHI ).
"B": Return to the reservoir (Integrated BHI ).
(1) Rear firmness regulator.
(2) Rear stiffener regulator accumulator.
"a" Variable firmness electrovalve.
"b" bleed screw(s).
"c" Hydraulic isolation slide valve.
"d" Electrovalve slide valve.
Firm status:
- The electrovalve is supplied
- The electrovalve slide valve "d" moves and frees up the return to the reservoir and blocks the hydraulic supply from the integrated hydroelectronic block
- The bottom part of the slide ("c") is at the pressure of the hydraulic fluid reservoir
- The upper part of the slide valve is under pressure from the hydractive sphere 3+
- The difference in the pressure at each end of the slide ("c") causes its movement
- In its new position the slide ("c") blocks the passage of hydraulic fluid between the RH suspension and the LH suspension
- The hydractive 3+ sphere is isolated from the suspension circuit