1961 Volvo PV544 in Holland

[Army]

Originally Posted by Derek UK

The bleed screw is a useful addition as there is often an air bubble trap here. There isn't one on the Girling or replacement Lockheed units. It can be done rather messily by loosening off one of the connections. The Amazon should have different size rear cylinders when a servo is added to to a non-servo car, something that's not often done. The servo in your diagram is increasing the pressure to the 5 way block in your diagram. That's 4 for the wheels and one for the brake switch. This is the same in the Amazon. The pipe goes from the MC goes across the back of the bulkhead and then forwards along the inner wing to the servo. The out line from the servo then doubles back to the distribution block. All this extra pipe can trap air as mentioned.
Rear cylinder size referenced here, right at the end. (Thanks Rob)
https://www.youtube.com/watch?v=RKPSws8LtNQ

That's great - thanks

From what I can figure out the correct 22mm (7/8") servo rear cylinders are part number 670404 (I'll be ordering a new set in the near future)