My 2011 E 550 rear suspension has electrical hum for 3-4 minutes for pressure equalization when driving after sitting overnight. Noise stops when decelerating at about 13mph & restarts when accelerating. Process continually occurs after sitting for 45+ minutes (takes less time). Rear suspension replaced at 8,000 miles; car now has 16,000--concern for future failure. Any ideas?
Marv
Marv
