Sorry my post is a little confusing ill try to un confuse it . The air built up before i drove off as normal and was staying up at the normal top range then on the way back stopped building so evertime the break was used there was getting less and less air in the tanks. I made it back but now...
So i have a iveco 7.5t eurro cargo and i took it for a drive and half way the air stopped building up? ?? It was fine until i went on a dusty gravel track.... Could dust and got in? Anyone know how to check?