RE: Marder Brake Servo....?
Hi Damo,
Yes this should be a 6V, just a typo, but all other data is fine: 12.1 KG at 6V.
If your friend will give you a 14.5KG servo, then you can check it, if this will be enough that you can buy the Hitec 5645MG and if not then you will have to look for something stronger like the Hitec 5955TG (By the way it has Titanium Gears).
Good luck!
Tom