Hi ,i had this trouble with mine as i have said before, there is an O ring on the end of the cylinder where the shaft comes out i had air leaking from this as well as air getting pass the O ring in the cylinder any side presure will cause this to leak, no matter what i did it would not hold air over night in the up and down postion,s,It is a good idea to use both tanks linked together this gives more volume,brakes are used at the end of a flight and are not that important.regards Keith


to check rams put air pressure on one nipple at a time and place in water there should,nt be any bubbles do like wise with the other nipple