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Gibbo205
Original Poster
1,416 posts
76 months
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Hi there Mike from S&C fitted me some new ceramic disc and pads just over a week ago. I drove the car for a good 100 miles, then I did some gentle braking to create some heat along with some more aggressive stops, so in total approx 250 miles of road driving on them. Yesterday I went to Donnington, kept my sessions short, sub 20 minutes, warmed them up for 2-3 laps, and cooled them down for 2-3 laps. I also fitted GT3 brake ducts too and kept a very close eye on them. Something I've noticed before and after the track day is some banding on the passenger side front. I've seen this before on cars, but normally ceramic disc always tend to appear quite clean and having had to change a set of front outs needless to say I am a tad paranoid. Here is pictures of the front passenger side disc:-   Drivers side front disc:-  As you can see the front drivers side has it far less and the rears have absolutely zero issues, but the rears are still on their original disc and pads. To the touch both disc are smooth and braking as Mike commented on is the smoothest he has felt and so so powerful with great feel. But I am concerned as to whether the effect on the passenger side disc is normal, should I be worried and why/what is it? Is it just the pads/disc still bedding in to each other, even if its nothing to worry about, would be good to know what it is?
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Sandy59
1,122 posts
80 months
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I'm on my second car with ceramics and never seen that before, I assume it was fine prior to starting the track day ??
Might be worth getting a bit of Scotchbrite or something simialr and gently seeing if these marks will rub off - can you feel any ridge ??
Other than that I'd be taking the pads out for a look, not a big job on the fronts.
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Raitzi
591 posts
81 months
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Sandy59 said: Other than that I'd be taking the pads out for a look, not a big job on the fronts. This. It looks more to be some thermal reaction residue from pads and not actually disc been damaged or anything. I also would feel it with finger nail if there is grooves or not.
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scarebus
772 posts
40 months
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Hi Gibbo
I have had similar markings on mine after track use but they cleared up after some gentle driving afterwards. Hopefully its just the pad material...
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Sandy59
1,122 posts
80 months
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PS - are you sure that last picture is of the drivers front, looks like the holes are curved forward instead of backwards so to speak - ie looks like 2 passenger side disks to me ??
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Gibbo205
Original Poster
1,416 posts
76 months
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Raitzi said: This. It looks more to be some thermal reaction residue from pads and not actually disc been damaged or anything. I also would feel it with finger nail if there is grooves or not. Nope no grooves, and the marks do seem to rub off if you rub hard enough. Both disc are very smooth to the touch.
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Ian_UK1
1,035 posts
63 months
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Sandy59 said: PS - are you sure that last picture is of the drivers front, looks like the holes are curved forward instead of backwards so to speak - ie looks like 2 passenger side disks to me ?? This ^^^^ does look wrong...
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doneitnow
516 posts
17 months
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Out of interest why did you have to fit new fronts?
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Gibbo205
Original Poster
1,416 posts
76 months
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doneitnow said: Out of interest why did you have to fit new fronts? The old ones were de-laminating badly, due to over heating, you can see images of them here on ebay:- http://www.ebay.co.uk/itm/Genuine-Porsche-997-PCCB...One side is in poor/average condition, the one one has well had it. They were fine for road use, though felt a little rough on the pedal as the disc were rough due to the pitting and they were eating pads.
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Gibbo205
Original Poster
1,416 posts
76 months
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Ian_UK1 said: This ^^^^ does look wrong... Think your right, or its the angle from the photo. Shall have a look later, not noticed anything under braking though, as in the car brakes in a straight line and stops very well with no issues. Though it would mean I've got an abundance of passenger side front ceramics, LOL, oh dear.
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Sandy59
1,122 posts
80 months
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I think the main worry if that's a wrong side disk will be the cooling - or lack of it !!
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Sandy59
1,122 posts
80 months
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Looks the right way up to me, but either way still wouldn't make it correct, I'm sure the Porsche caliper transfers are also the correct way up.
Only really noticing all this as I recently changed out my 968 disks, not a complete Porsche brake anaorak !!
Had a look at the old ones on e-bay and they seem to be 'right/left handed' as you'd expect.
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Bennachie
459 posts
20 months
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I concur with the two offside discs theory. The 'arc of cross drilling' arcs the 'wrong' way.
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Gibbo205
Original Poster
1,416 posts
76 months
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Sandy59 said: I think the main worry if that's a wrong side disk will be the cooling - or lack of it !! No I think you are right, the drivers side has a passenger side disc on it. Not a lot I can do about it right now, unless someone knows someone with a good condition drivers side front ceramic lol. Though as in general drilled disc does not aid cooling that much, I am not overly concerned about any lack of cooling. I was monitoring temperatures on Saturdays track day and both passenger and drivers side tyres with more or less equal. If there was a serious cooling issue then the drivers side wheel would be massively hotter than the passenger side which is not the case, they are/were practically identical. But I shall monitor closely and if anyone ever knows of a spare set of fronts going, or two drivers side front ceramics, I'd give them home as then I'd have two full sets of good ceramics.  I've been to Porsche today to sort a warranty claim and a few other trips out, checked passenger side and the banding does seem to have gone and both disc look nice and clean, also ultra smooth.  I shall just keep a very close eye on them. They are damn expensive!
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Porkupine
1,553 posts
34 months
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Where's mike? Did he not notice this when fitting!!
Also, aren't ceramics supposed to last forever!!
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Sandy59
1,122 posts
80 months
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I think the cooling is actually down to the vanes inside the disk, and the direction they face. The cool air is guided to the centre of the disk on the inside, and then exits through the centre vented area which is convoluted. If these channels are facing forward instead of backwards then I can't see the hot air being able to escape properly.
At least that's how they were on my 968.
Not sure how much the disk holes actually aid cooling to be honest.
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sportsandclassic
3,525 posts
87 months
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Porkupine said: Where's mike? Did he not notice this when fitting!!
Also, aren't ceramics supposed to last forever!! Yes I did mention this at time of installation that it was the same disc for both sides of car. The brakes will last as long as they are looked after for, nothing lasts forever!
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ROK
245 posts
21 months
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thus the reason why you go w/ good ol' steel. peace of mind and you're not giving up anything in performance. just a lot more brake dust and less cars and coffee power.
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Gibbo205
Original Poster
1,416 posts
76 months
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Sandy59 said: I think the cooling is actually down to the vanes inside the disk, and the direction they face. The cool air is guided to the centre of the disk on the inside, and then exits through the centre vented area which is convoluted. If these channels are facing forward instead of backwards then I can't see the hot air being able to escape properly.
At least that's how they were on my 968.
Not sure how much the disk holes actually aid cooling to be honest. Shall check the vines inside the disc on my older ones tonight, but from what I can tell from what I remember they are not angled or at least to what I can see with the eye. When I do next track day, I shall look at getting a temperature probe I can place on the disc to see if there is any real difference in the actual disc temperature, but on Saturday they performed flawlessy.
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LaurasOtherHalf
6,317 posts
65 months
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Temperature probe? & I thought I got funny looks with a pressure guage!
Not sure I could be bothered with all that faff like
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