Cross drill != crack rotors.

[Igor Kessel <four_rings@worldnet.att.net>]

>I got some nice brembo rotors and when installing them, my mech. said that 
>they will crack.  "Its not IF they will crack, its WHEN it will crack?"  This 
>kinda scared me a bit.  Q-list confirm this?

>From my personal experience from '92 onwards:

In both my '85 5000s and later in the '89 200TQ with the completely
stock brakes rotors warped like propellers in a few energetic stops in
street driving.

Later in the same '89 200TQ:
FR: cross-drilled, vented Brembo; 
RR: cross-drilled, solid ATE;
SS Teflon lined brake lines;
PBR/Axxis pads;
German Pentosin DOT-4 brake fluid.

The car stopped _very_well_ on the street. Reasonably well on the track.
The rotors have never warped or cracked since.

My current '97 S6 which is [still] completely stock has a joke for
brakes in comparison with my old 200.
This car will eventually get the cross-drilled A8 rotors, Boxter brakes
and the SS lines.

The drilled rotors have a pronounced "flute" side effect. I.e. when
driving in the left lane next to a concrete divider while braking hard
you will hear a loud buzzing. It's the hot air that is escaping from
under the pads through the holes in the rotor. The whole rotor sounds
like a flute.

-- 
Igor Kessel
Two turbo quattros.