All the images I found were drilled rotors with the crack going through the hole. I didn't find any images of a solid rotor with a crack.

 

Here you go:

http://dpcars.net/mini2/m174.jpg

 

Wow, that's cracked throughout. Looks like it would shatter into a thousand pieces.

 

If you check out his website at http://dpcars.net/ and go to the Mini section. He talks a bit about the rotors in the photo. The car gets run real hard so the wear seems to be somewhat expected. On the bottom of the page detailing the brakes he mentions the car has been through 22 track days in a little over a year.

 

Solid slotted rotor with a large crack-
http://www.devtools.org/mt/rus/archives/000112.html

The cracks are easy to see. Either you get them or not.
Don't wait until the crack is huge, it might totally fail or damage your brake pad as in that link.

Generally when you have highly stressed parts (get plenty of heat when used) you don't want any cracks in metal that are visible. These are not cosmetic cracks.

 

Have just found this....

Mov'it the brake







They also carry Ceramic brake kit for MINI as well.

 

Drilled rotors versus Slotted rotors question.

I am going to try to answer with this question

How many Ferraris, Lamborghinis and Porsches have you seen leaving the factory with slotted rotors?????

Of course, this is only for street/high performance street driven machines.

Victor

 

I ended up go with minor upgrade from JCW.

 

Rotors are going to be expendable items for the more hard core track day users. Like tires and pads they have a service life. Generally more mass is the key to longer life. With the popular Wilwood kits shown there are some limitations to mass based on the packaging size of the kit. For more mass you'd simply need to move to a larger kit. At the expense of cost and wheel clearance. There's no free lunch.

 

If you compared Drilled rotors and Slotted Rotors, the drilled ones help release the water and are best in rainy conditions, while Slotted rotors shake off the brake dusts and are best in street performance.

 

Holy necroposting Batman!