cracked discs
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Diver944
Active member
That can't be road driving surely? I won't use drilled disks because I do a lot of track and want to avoid exactly that cracking problem. Was that 250 road miles, because the face of your disk look much more worn in than my new ones which are now a month and a thousand miles old [&:]
NorthernBloke
New member
hmmmm, worrying.
I assume you were taking it easy in order to bed the disks in otherwise they are prone to warping and cracking if drilled?? (sorry if grannies and sucking eggs springs to mind)
I assume you were taking it easy in order to bed the disks in otherwise they are prone to warping and cracking if drilled?? (sorry if grannies and sucking eggs springs to mind)
eastendr
New member
It looks like your rear calipers may be partially seized / check the plates haven't lifted.
As regards drilled discs, If they were crap, manufacturers wouldn't fit them and they wouldn't be used in motorsport, would they ?
Or Porsche, Ferrari, Brembo etc not know what they're doing ????
My only experience of cracked discs is on touring cars where radial cracks can eventually occur. Then again, I've seen a disc come off after a race, be dropped on the floor and shatter into pieces ! These were 370x32 mm AP's.
I've not found them less effective than solids in any conditions, and indeed superior in the wet. [
]
As regards drilled discs, If they were crap, manufacturers wouldn't fit them and they wouldn't be used in motorsport, would they ?
Or Porsche, Ferrari, Brembo etc not know what they're doing ????
My only experience of cracked discs is on touring cars where radial cracks can eventually occur. Then again, I've seen a disc come off after a race, be dropped on the floor and shatter into pieces ! These were 370x32 mm AP's.
I've not found them less effective than solids in any conditions, and indeed superior in the wet. [
]
eastendr
New member
It's not my intention to change anyone's opinion.
I'm just speaking from my own experiences (not even mentioning M030 on 968 []).
Others experiences HERE, HERE, HERE
These are a cross section of threads that present all sides of opinion, although I gather that you may not always appreciate the opinions of some Rennlist members ? [][][]
I'm just speaking from my own experiences (not even mentioning M030 on 968 [
]). Others experiences HERE, HERE, HERE
These are a cross section of threads that present all sides of opinion, although I gather that you may not always appreciate the opinions of some Rennlist members ? [
][][]
I don't believe they are, but they only last for one race, only work at temperatures far higher than your brakes will ever get to, and are used to stop a car 1/3 the weight of a 944. Brakes for road and F1 are very different. Brakes for road use must work in all conditions and at all temperatures, where as brakes on a racing car don't work when they are cold.
Personaly I find cross drilled brakes work for me. They seem to provide more bite and reduce pad glazing. It tend to be a bit of a disc polisher in normal driving, breaking very gently, and so cross drilled brakes work well in my case. At the other extreme, I boiled my fluid (twice) at Snetterton and yet the discs don't seem to be degraded as a result.
I would have to suggest that, for discs to degrade so significantly, in such a short period of time, they were either stressed when drilled (i.e. badly manufactured) or overheated without bedding in.
Granted there is a difference in discs that have been drilled and discs that have holes cast in them during manufacture but, from an outright performance point of view, and despite the earlier comments of learned contributors, in my experience, perforated discs do work better than solid discs.
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