Just a thought...
Do you have alloy wheels, and so did you fit a steel spare?
If so, it's possible that you fitted the steel spare wheel with the bolts that came from the alloy wheel, which, as the steel wheel is thinner than the alli one, the bolts go too far through and foul on the brake caliper.
Usually dosn't free off that easy though.
You might have shorter wheel bolts for the steel spare wheel.
E200 Wagon 1994 108 k miles