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Use them hard enough for road course work, and it's going to happen.
On the C5z's, you would just end up bending the calipers U sections too far open when used for track use over time, and had to replace them as well.
So the C6Z's are a little stronger to resist the old C5z U slot bending open problem, and instead they end up cracking at the end of their life cycle of hard use instead.
Or to put it better, if you are throwing in cheap ceramic pads, and trying to get them to perform like the HD pads with too much brake pedal pressure as they quickly fade, your using the calipers hard enough to cause the problems as well.
Use them hard enough for road course work, and it's going to happen.
On the C5z's, you would just end up bending the calipers U sections too far open when used for track use over time, and had to replace them as well.
So the C6Z's are a little stronger to resist the old C5z U slot bending open problem, and instead they end up cracking at the end of their life cycle of hard use instead.
Or to put it better, if you are throwing in cheap ceramic pads, and trying to get them to perform like the HD pads with too much brake pedal pressure as they quickly fade, your using the calipers hard enough to cause the problems as well.
I've never heard about that before. Thank you for the info. My day is complete, I learned something new again.
I have inquired with several other sources that use their C6Z for autox and track. They were not aware of any caliper failures. My C6Z has about 6000 miles and is used regularly for autocross. The brakes pads are oem.
The supplier of the calipers are PBR. I would like to get their comments on the picture. Anyone have a contact number for them?
There are a lot folks doing track and autox events and then driving their Z on the road everyday. Is this a safety issue that needs to be addressed?
The supplier of the calipers are PBR. I would like to get their comments on the picture. Anyone have a contact number for them?
PBR is Australian. I happen to think that their brakes are junk, but that is just my opinion. I had a set on my car for about a day and replaced them with Wilwoods.
For information on where to buy PBR products, please contact:
Louis Luera
Marketing Manager - North America
FMP Group (Australia / Malaysia / Thailand) Pty. Ltd.
Makers of OEM, Bendix, PBR, Axxis and Private Brand Friction Programs
North American Office
Phone: 760.295.6034
Cell: 619.204.7146
Email: bmna@msn.com
Yep to above, and the sad part, although the brake on the C7 are being produced by Brembo now, they are not Brembo's High performance series race caliper, but instead a low budget OEM model for GM instead.
So time will tell if Brembo falls in to the same pitfall as PBR, being GM wanting to buy them for less and less money each year/design change, and by the end, total ***** calipers as well (worse them being just OEM cheap value model to begin with, no matter who's name is on them).
So on that note, since the opt is putting the caliper through their paces with track use, time to strip the value brand OEMs off the car, and replace them with actual races series caliper isntead.
To add, you can call PBR, but since they are GM OEM's, they are going to point you back to GM isntead. Hence GM had most of the say on what they wanted in a caliper (read cheap as hell to buy from PBR), so it hard to hold PBR to the fire isntead.
I found the pads to be wearing at a taper from top to bottom. Here is what I think is part of the reason. Looking at the picture of the back side of the pad you will notice that the pistons are not pushing against a flat surface, causing the pads to wear off at the top first.
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
The pad taper you are seeing is due to the caliper just being weak, and is pretty normal under track use. Something we have seen since the cars came out.
Going to a one piece pad will help this, but not solve it because the caliper itself isn't strong enough to handle hard use lap after lap on track.
Like the others have said, it is hard to tell from the pics but I seem to think those are mold lines when they made them and not a crack, just need better pics.
If you are going to really push the car on track, your going to need better brakes.
09-14-2016, 11:06 AM
C6Z Caliper Stress Cracks
