does you car have ABS?
and is it that kind of pulsating grinding or is it more menacing.

which if you did and it was might mean a bad wheel speed sensor.
or less likley somthings bad somewhere else in ABS system -pumping brake's when it should not.

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14