I promise not to offend anyone ...
>From the book "Brake Systems" by Mike Mavrigian & Larry Carley:
"Cross-drilling was done to help reduce the gas buildup between the pad &
rotor ... with some pad compounds, the heat would react with the pad,
casuing the resin binders within the pad material to rise to the surface (as
a) gas, which creates a gas pressure layer between the pad & rotor" ....
"However, with today's carbon pads, this gas buildup does not occure, hence
many experts feel there is no need to drill the rotor (other than for weight
savings)."
He goes on to say "you probably shouldn't cross drill any rotor ... on your
own. However, if the rotor maker drilled the part, then assume it's a move
for the better" (but he doesn't explain why)
Furthermore he states "slotting, however, does provide a benefit that few
can argue with ... ensures that .. the debris particles are cleared away
from the face of the pad & rotor"
For what it's worth ...
Mark Palmer
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