I have 13" Baer units on the front of my 67 SS and they're
slotted, drilled, and zinc plated. Here's what Baer has to
say:
<quote>
What are the
benefits to Crossdrilling, Slotting, and Zinc-Washing my rotors?
In
years past, crossdrilling and/or Slotting the rotor for racing purposes
was beneficial by providing a way to expel the gasses created when the
bonding agents employed to manufacture the pads began to break down at
extreme temperatures. This condition is often referred to as “green pad
fade” or “outgassing”. When it does occur, the driver still has a good
firm brake pedal, but simply little or no friction. Since this normally
happens only at temperatures witnessed in racing, this can be very
exciting!
However, with today’s race pad technology, ‘outgassing’
is no longer much of a concern. When shopping for races pads, or even
ultra-high performance road pads, look for the phrases, “dynamic surface
treatment”, “race ready”, and/or, “pre-burnished”. When these or similar
statements are made by the pad manufacturer, the pad in question will
likely have little or no problem with ‘outgassing’. Ironically more
pedestrian pads used on most streetcars will still exhibit ‘outgassing’,
but only when used at temperatures normally only encountered on the
racetrack.
Although crossdrilling and/or slotting will provide a
welcome path to expend any gasses when and if they develop, it is
primarily a visual enhancement behind today’s often wide-open wheel
designs.
Crossdrilling offers the greatest gas relief pathway, but
creates potential “stress risers” from which cracks can occur. Baer’s
rotors are cast with crossdrilling in mind, from the material specified,
to curved vanes, behind which the holes are placed to minimize potential
crack migration. Slotted surfaces are what Baer recommends for track only
use. Slotted only rotors are offered as an option for any of Baer’s
offerings.
Zinc washing is then done to provide a barrier, which
resists development of surface scales or
rust. |
<end
quote>
Dale McIntosh
TC Gold #92/ACES #1709/NECOA #41
67SS/67 Elky
DalesPlace My 67
SS and 67 El Camino
ChevelleStuff Decoding info on 64-72 Chevelles
Team67 1967
Chevelle/El Camino Specific
MidwestChevelles Midwest Chevelle Show Information
I've stopped 2,342 spam messages. You can too!
One month
FREE spam protection at www.cloudmark.com
I am converting
over to front disc brakes 1966 Malibu! Any one have experience
with slotted rotors, slotted & drilled, or drilled only?? I have
heard the horror stories about drilled ones w/ cracks between the
holes!! I have heard the holes are smaller now and not as much
trouble!! Brands: Brembo, Roto-Tech, Power Slot, BPI (USA)
Speedstop, BPC they make them for GM, DELCO, WAGNER, BENDIX,
RAYBESTOS!! Anyone know these brands?? What is a good plating Zinc,
Cadmium etc. ??? What type of pads are good to use on slotted or
drilled/slotted rotors?? I want to spend a little extra and get good
rotors!!
Thanks.......Doug
