PerkHouse,
Quoted directly from the book:
" Prior to pushing the piston into the caliper, position it so that its raised section will be positioned uppermost when the caliper is refitted.MB dealer use a special guage to ensure that the piston is correctly positioned.
The purpose of this procedure is to have the piston contact the pad, contacting the rotor at a slight angle, to reduce the possibility of brake squeal. "
The picture shows the caliper ( in a mounted position, with the raised portion of the piston starting at 9'o clock and, going clockwise, ending at the 4'o clock position ).
Make sense?
