Brake Light On problems of the 1999 Land Rover Discovery Ii

I recently bought a Land Rover discovery 2 (1999 model - 75,000 mi. ). My abs brake light, hill decent light, and traction control lights keep coming on intermittently. I have read hundreds of complaints on this issue online. Apparently the 3 items (abs, hill decent, and traction control) are all interconnected items - generally called three amigo problem online. The major concern is that the abs does not work and the brake pedal will sometimes go to the floor, brakes shutter and on occasion barely engage at all. I have almost wrecked the vehicle on a couple of occasions. I have no choice but to drive my car. I can't afford the $3500 the Land Rover dealer wants to fix this design flaw. I can't get rid of the vehicle because nobody wants to buy or trade for a car with all these warning lights on. Again, if you look online you will see that this is a Land Rover design flaw and that almost every one of theses vehicles is affected. Land rover claims it is from abuse or lack of maintaining this "wearable item. " if this was really the case, would thousands of people, with mileage ranging from new to hundreds of thousands of miles, have the same problem?.