Depending on the year and configuration of the attachment locations can vary.
Front bumper
-open the hood.
-under the hood, Unscrew the two screws and take out the four clips.
-take out the four piston and Unscrew the three screws in the bottom of the (twisted and inserted from the bottom up).
-wrenched the wheel to the side.
-wheel arches take out two pistons on each side and removed the wheel arches (the front part).
-for wheel arch liners Unscrew one screw on each side (twisted upside down) holding the corners of the bumper to the wings.
-we release the latch in the wings (pull the corners themselves).
-with the assistant pulls the bumper forward (look for wires).
-switched the hoses to the headlight washers (if any).
-release the connectors for fog lights and temperature sensor (if any).
Rear bumper
-open the trunk lid.
-on the perimeter in the opening of the trunk, Unscrew the screws.
-Unscrew the screws and take out the rivets that attach the lower part.
-wheel arches take out the caps and removed the wheel arches (rear).
-the fender liner, Unscrew the screws holding the corners of the bumper to the wings.
-we release the latch in the wings (pull the corners themselves).
-with the assistant pulls the bumper backwards (look for wires).
-snap together the connectors of the equipment (if any).
How to remove front and rear bumper Mercedes Vito V-Class W638
How to remove front and rear bumper Mercedes Vito/ Viano V-Class W639