Hi again... I have jacked up my d2 today to look at replacing brake pipe that has split,while jacking rear passenger side (under axle)i think i could hear air leaking from the bag and the bag entirely deflated,when i lowered car to ground again it was sat right down on the stops. turned engine on and pressed the raise button and it came back up and seems to be holding again now.Is this normal? do i need to replace bag or is it best to do coil conversion ? i plan on pulling my caravan and kids around a lot this summer don't want to be sat in a field with its arse on the ground lol. Many thanks for any help ,Matt