The abs on the wife's dse is playing up, reversed of the drive this morning and the brake pedal went almost to the floor, I pumped the brake pedal a couple of times and drove forward a little the pedal then came back, but the abs light then stayed on till I got to about 25-30 mph then went out, Anyone got any ideas? is the abs system pressureised like on a few french cars? I was wondering if it would need gassing up?