general problems of the 2008 Chevrolet Express 1500

The brake system completely failed. The peddle goes to the floor. There is still fluid in the reservoir to proper level but all brakes failed at the same time no stopping ability. Had to use parking break to slow and down shift to first gear. This flaw could have killed or injured every passenger/occupant (s) as well as harmed other drivers on roadway/motorway. There should be some type of safety measure to aid in stopping even if a partial failure. But this is a whole system failure. Please advise.

Purchased a new 2008 chevy Express 1500 within 9 mos had abs and stability traction light on. Tech replaced wheel sensor. Happened again 6 mos later, 4/7/09 and 5/15/10. On my last visit they said they found a short, but the lights are on again 2 weeks later. The safety issue is when the abs and stability traction light is on (and only when traveling below 30 mph) when applying brakes, the abs automatically will allow the brake pedal to go down almost to the floor. This in turn allows the vehicle to travel additional distance when trying to stop. This happens on perfectly level, smooth and dry circumstances. One of the mechanics at the dealer's service department stated to me that this problem exists in many chevy vans up to and including 2010. Obviously they have no clue as to what is causing this malfunction. Some other mechanics have said they feel it might be a computer glitch. It is only of matter of time, and probably has already happened, when trying to stop - rear ending a vehicle or striking a pedestrian who has stepped out in front. Please advise as to what course of action should be taken with gm.