Advice on Caging Brakes - or is there another way to move my truck..?

I need some advice from you as I have a lorry I can't move. I have a Renault Midliner which I have been storing in a barn for the past few years. I need to move it out, but both batteries are dead, so I can't start it. The brake are obviously locked on now due to lack of air pressure.

I have looked up the process of 'caging' the brakes, but my breaks do not look like any others I have seen. I will upload a few photo's and perhaps someone will be able to tell me what to do. Hopefully someone will be able to suggest a way I can cage the brakes to allow the unit to be moved.

I do not want to go to the expense of buying two new batteries for it, just to move it. So any help advice would be appreciated.

Thanks,

 

Thanks for your reply. Do you mean I should turn the bolt arrowed clockwise? I presume this acts the same as the caging bolt on other systems?

 

Thanks for your advice on this. I will attempt to turn the bolts this weekend when I have a little time. Hopefully it will looses off the brake pads enough to allow me to tow the truck out of the barn..!

 

...trouble is I have no compressor to fill the system. I understand it's the safest way, but I will make a set of chocks and ensure I use them before and after I move it. I will then re-apply the brake pads afterwards when it's in the correct place.