the 4Matic feature can be turned off temporarily but this is only intended to get home or for short distances, not as a permanent solution. Matching tires (in my experience) does not matter as long as they are they same size and have the same amount of wear. Problems with front ABS do not mean a problem with the 4Matic but maybe what you are asking is if a problem with the front ABS can APPEAR as a problem with the 4Matic - which it can.