Servo front discs only

[Bill_qaz]

After Geoberni posting brake pipe layout I traced my pipes today. The car came with Marina front discs and servo when purchased and when checking found that only the fronts are servo assisted. The rears run off the mastercylinder as standard.So the front pipe from mc goes to servo and the servo output goes to the original junction at offside front with brake light switch.
The brakes feel fine and I have no issues or intention of changing the layout.

I just wondered does anyone else runs servo fronts only?