This a 4-matic wagon, we took the rear suspension out and the bags, now the the same bags wont fill back up. No sound, no pumps running. Fronts goodwe took the rear susp out to replace a alum susp part that goes from wheel to wheel. The bags were fine, we let air out to get-em out. Now its all back in and the air -susp system makes no sound in the rear susp area. We may have a sm leak, does that matter? Also it was mentioned that it was jacked up for a while without the susp shut-off switch being off.