A while back, my mechanic put new brakes on the van.  Ever since, they have
exhibited vibration problems when stopping.  Seems to be a progressive
problem.  Turns out metalic brake pads  were used (both front and back).
The word I get is that metalic pads can generate heat and leave residue on
the drums/rotors.  The residue builds up and that is what the pads are
hitting when I try to brake.  Questions:

1)  Can metalic brake pads be used on the Vanagon or should I stick with
organic pads?
2)  Could something else be causing the vibration to occur?

Note:  I have been able to reduce the vibration by stomping on the brakes
and not coming to a stop which doesn't generate the sustained heat and wipes
the metal surfaces.  This reduces the vibrations but I still need to know if
there is anything else I can do.

William