The drilling is also supposed to help against warping, and give a nice indication
of when the disc is worn out! No groove left, replace discs.

PerL
87 Syncro 112i

KENWILFY@AOL.COM wrote:

> I have been wishing for a while that ATE would make their powerdisc rotor for
> the Vanagon and today I found out that they do but only for the 80-85
> Vanagons (also work on some of the later buses from 75-80).  These rotors
> have several grooves all the way around on both sides of the rotor (kind of
> looks like the symbol for the atom) that are supposed to allow gasses that
> are released when you apply the brakes, to have a place to escape.  What I
> have been told is that normally these gasses make a barrier between the pad
> and the rotor, (that is why they drill rotors too) but this design is
> supposed to help allow the gases to escape and give you better braking.
> Also, because they aren't drilled there is not the possibility of the stress
> cracking that is associated with drilling, nor the warping problem that these
> sometimes have.
> Anyway, these rotors are $75 each from me.  I'll put them on the website
> later today as PN 251407617APD or you can call in an order.
>
> Thanks,
> Ken Wilford
> http://www.vanagain.com
> John 3:16
> Phone: (856)-765-1583
> Shop:   (856)-327-0027
> Fax:     (856)-327-2242