V12V carbon ceramic Q’s
Discussion
I’ve had my 2 previous owner, 35,000 mile V12V for a month or so now and am really enjoying it.
I’ve got a question about the CC brakes which fellow owners may be able to comment on.
When I collected the car the discs all looked lovely but since then I’ve noticed a couple of them, both offside incidentally, have started to show signs of radial running marks. Definitely not grooving as they are imperceptible to the touch but they are obviously visible as the pic below shows
I’ve never had CCBs before so not sure if this is normal and caused by small bits of grit etc stuck between pad and disc, much the same as you’d see with steel discs? I’ve never come across pics of CCBs looking like this, only pics of pristine surfaces or ones which have catastrophically failed.
I am certainly using the brakes in a ‘sporting manner’ so to speak and am very impressed with their bite once you get a bit of heat into them.
Have people come across this with their brakes?
Cheers, Liam
I’ve got a question about the CC brakes which fellow owners may be able to comment on.
When I collected the car the discs all looked lovely but since then I’ve noticed a couple of them, both offside incidentally, have started to show signs of radial running marks. Definitely not grooving as they are imperceptible to the touch but they are obviously visible as the pic below shows
I’ve never had CCBs before so not sure if this is normal and caused by small bits of grit etc stuck between pad and disc, much the same as you’d see with steel discs? I’ve never come across pics of CCBs looking like this, only pics of pristine surfaces or ones which have catastrophically failed.
I am certainly using the brakes in a ‘sporting manner’ so to speak and am very impressed with their bite once you get a bit of heat into them.
Have people come across this with their brakes?
Cheers, Liam
Edited by LiamV12V on Sunday 30th September 09:37
Mako V12V said:
Hi Liam, I wouldn’t say this is normal. Not seen this before. But if you can’t feel these marks it may be nothing. But. It may be a pad issue? How old are the pads, have they ever been changed. Given the mileage it may be a pad issue as they may be due for change. Was it a dealer purchase - take it back to them or a AM main dealer and take advice.
I would only drive the car lightly until resolved as you don’t want to be doing any harm to the discs.
Good luck and let us know how you get on.
Hi, yes bought from an AM dealer with warranty. It’s got a full AM history but no record of any pad changes in the book. There looks to be about 6mm of pad material still present on all 4 corners. Will make contact with them and see what they say. I would only drive the car lightly until resolved as you don’t want to be doing any harm to the discs.
Good luck and let us know how you get on.
Cheers
Edited by LiamV12V on Sunday 30th September 17:47
V8V Pete said:
My understanding is that you cannot inspect the pads on V12V front brakes without removing the calipers. So my first thought would be to have a look at the caliper bolts to see if they've been removed recently. If not then they've just eyeballed the pads in situ which won't tell you anything about pin breakthrough 
The callipers were off as they specifically stated they’d had to get new bolts.BamfordMike said:
You could measure the distance from the pad face at point of contact with disc to the pad backing plate.
From the backing plate, the friction material of a brand new pad is 10.7mm
From the backing plate, the mounting pins breakthrough @ 6mm - which is the distance in my pic marked in red.
If you measure greater than 6mm, all is good. 6mm or less, time to change the pad.
You could ask a dealer for their comments on the difference between when the wear lead triggers (3mm) to when the pins breakthrough (6mm). The pins are required for strength and perhaps the theory is the soft pin material will not adversely wear the disc during that 3mm window. My experience is to the contrary, perhaps because in use over years of thermal cycles a sort of tempering process has taken place? and in that 3mm window of pin breakthrough to the wear lead illumination, damage to the disc will occur.
They measured the pads as 8mm front and 7mm at the back. I’d estimated approx 5-6mm all round.From the backing plate, the friction material of a brand new pad is 10.7mm
From the backing plate, the mounting pins breakthrough @ 6mm - which is the distance in my pic marked in red.
If you measure greater than 6mm, all is good. 6mm or less, time to change the pad.
You could ask a dealer for their comments on the difference between when the wear lead triggers (3mm) to when the pins breakthrough (6mm). The pins are required for strength and perhaps the theory is the soft pin material will not adversely wear the disc during that 3mm window. My experience is to the contrary, perhaps because in use over years of thermal cycles a sort of tempering process has taken place? and in that 3mm window of pin breakthrough to the wear lead illumination, damage to the disc will occur.
They seem to think it may be grit etc which has found its way in between the disc and the pad. Which must happen on CCBs just the same as steels, presumably?
As there’s no physical damage e.g grooving at this point they are saying to wait and see if the situation develops any further.
I’m baffled, as I said at the start I’ve never seen running marks like this on pics of CCBs...
kev1966900 said:
Liam, Bill and the guys at AM Edinburgh are usually pretty good. However I did hear that Roddy McAllister their Dealer principle was going to be the AMOC area rep. Drop him a note if you've still got concerns and i'm sure he'll look into it for you
Yes, I’ve spoken to Bill a couple of times now and he’s spot on. I’ve no problem with Edinburgh’s service on this issue, they’ve been very helpful and understanding.LiamV12V said:
cayman-black said:
Well if it was some grit and they removed the pads and refitted those marks should disappear soon.
I shall be testing that theory this weekend ;-)They don’t half produce dust when used “properly”...
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