My Pajero 3.2 lwb auto is making a glug glug bumpy noise on the rear axle when moving slowly with steering turned in either direction and when brakes were applied. Checked drive shaft and joints,diff is not locked,ran the rear wheels while free and created a sharp turn effect by braking the wheels individually, I could hear the spidergears operating but no glug glug noise. Could it be the ABS braking system?