Brake Drum Wheel Cylinder problems of the 2000 Jeep Grand Cherokee

My wife and I purchased a 2000 Jeep Grand Cherokee from the dealership. About two years ago the 4. 0 liter 6 cylinder engine started using coolant and causing the coolant light to alarm. The oil pressure would drop to "0" and sound the check gauges alarm. We took the car to the mechanic shop for costly repairs and troubleshooting. They replaced the water pump, couldn't find any leaks, and replaced the oil pump and rear main seal. They checked the bearing clearances and found them within tolerance. The car is still using one to two pints of coolant every three days and the oil continues to drop to "0" after warm-up. We replace the 4 wheel disc brakes and rotors every two years. The hood gas shocks won't hold the hood up and the shocks cost $150 a pair form the dealer and only last one year. We to have electric door locks that screech and don't lock the doors as well as rear light problems that work off and on. The emissions are much higher than normal on our recent smog test. This is an indication that the #3 and 4 cylinder is using the mysterious antifreeze loss. As a retired mechanical engineer I also believe the oil problem to be related. My wife has the Grand Cherokee and I purchased a tj wrangler new in 2000. I'm concerned this vehicle will develop the same problems having the same engine. We have invested over $50 thousand in these two cars. We need your help to help us offset this burden.

The contact owns a 2000 Jeep Grand Cherokee. The contact stated that she has to depress the brake pedal down to the floor in order to stop the vehicle. She replaced the brakes and cylinders on three different occasions due to squeaking noises and the increase in stopping distance. The contact experienced the squeaking and screeching noises while driving 25 mph and greater. The most recent failure occurred on may 16, 2007. The VIN, purchase date, and engine size were unavailable. The current mileage is 112,000 and failure mileage was 30,000.