Re: Rotor\'s gone bad?? Pics inside.......
Those are simply heat stress cracks. From what I see in the pics above, there is nothing to worry about. Pretty normal **** when you track tour car. Like it was mentioned above, if they become larger cracks joining the holes, then you may want to start to worry.
Chuck, is that not one of the reasons drilled rotors are not recomended for track use on our heavy cars?
The problem is that the car is almost not driveable...
From Baer website.
What are the benefits to cross-drilling, slotting, and zinc-washing my rotors?
In years past, cross-drilling 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.
Hopefully they will back up the last line.
EradiSpeedTM represents our premium line of performance rotors. Featuring the dynamic appearance of cross-drilled, slotted and zinc-coated surfaces, EradiSpeedTM units are also purpose-cast with quality iron materials for performance far beyond the factory units they replace. Furthermore, EradiSpeed´s curve-vaned design also provides greater airflow and heat dissipation.
EradiSpeedTM rotors feature:
* Faster thermal recovery
* Increased heat absorption
* Increased friction and lower wear
* Cross-drilled, slotted, and zinc-washed surfaces
* Limited lifetime warranty against warping
