Brake Electric Antilock problems of the 1999 Mercury Villager

We own a '1999 Mercury Villager van. The brakes have had extensive repairs twice ,and now must be replaced again after only 13,000 miles. Secondly, the accelerator sticks. It has been repaired once and requires repair again. (first time under warranty. This time at a cost of approx. $460. ) the repairmen at the dealership claim the device used to prevent sludge from accumulating on the accelerator line tends to warp due to heat exposure allowing sludge to accumulate on the line and causing the accelerator to stick. It was first repaired at 35,000 miles and now requires a second repair at 73,000 miles.

Brakes are grinding and making streaking noise. Also, tires are split. Dealership is aware of the problem.

When applying brakes a noise occurred and pedal went to the floor ,causing extended stopping distance. Please give any further details.