Also sounds like he's about to develop pressure loss on all 4 tires.
Did you know that if you take a valve stem cap off and use a core tool to loosen the core enough to just barely hear air escaping and then replace the cap, the tire will go flat in 6-8 hrs? If you do it just before someone leaves for the day, they will be able to drive home just fine but they will wake up the next morning with 4 flat tires.
Or so I've heard...:rolleyes: