I'm not a tech or anything, but as far as the air pump, sounds like something is clogged maybe? Causing it to not be able to allow air to flow so it pops the hose off?
And as far as the cruise control, I think most cars are controlled by a vaccum, so you might have a leak int he cruise control or vacuum system.
But remember I'm not a tech, but it could be a place to start.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.