Brake Antilock Control Unit/module problems of the 2002 Land Rover Discovery Ii

The brake pedal is very soft. The traction control and abs lights flash on at-will. Took the vehicle into Land Rover anaheim hills who determined the abs modulator is going out and will need to be replaced. Purchased the vehicle with approximately 74k miles. Mileage when taken to dealership was 78,490. Five days after purchasing vehicle, had the rear brake pads replaced; yet, no improvement on braking distance, feel of brake pedal. When pumping the brake pedal rapidly twice, the brakes stop responsively. Otherwise, the brake pedal depresses a number of inches before actually halting the vehicle.