Hello Peter
How about this for a theory....
The new servo is extremely sensitive - the smallest dab of the pedal operating the brakes. Not unusual in a modern vehicle. What if it is just the residual pressure applied by the unloaded pedal that is causing the servo to operate slightly? That combined with your drum brakes could be the problem. From this thread it is just the rear brakes that are binding - yes? That is the main difference between your installation and everyone else that has used it I believe. You have drums at the rear - everyone else has disks.
If it is just the residual weight of the pedal, then a return spring should resolve it.
Robin
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