Porsche Club GB

Spidery cracks on my drilled discs.....

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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Discussion summary

YOUR RESEARCHSpidery cracks on my drilled discs.....

Leading reported evidence

Replace heat elongation conditions)

Suggestion or failed attempt

No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
material fatigue (changing heat elongation conditions).
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Spidery cracks on my drilled discs.....

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Leading evidence: 'Replace heat elongation conditions)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace heat elongation conditions)' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Use of brakes

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Suggestion · Original poster
I am hopeful they are the latter and may disappear with normal use of brakes.
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Spidery cracks on my drilled discs.....

Use of the brakes

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Discussions that contain suggestions: 1

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Suggestion · Original poster
One other point of concern which I have had reassuring advice about- I showed the car some hard use of the brakes.
Original post Read captured discussion
Spidery cracks on my drilled discs.....

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace heat elongation conditions)

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
material fatigue (changing heat elongation conditions).
Original post Read captured discussion
Spidery cracks on my drilled discs.....

Use of brakes

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I am hopeful they are the latter and may disappear with normal use of brakes.
Original post Read captured discussion
Spidery cracks on my drilled discs.....

Use of the brakes

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
One other point of concern which I have had reassuring advice about- I showed the car some hard use of the brakes.
Original post Read captured discussion
Spidery cracks on my drilled discs.....

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Porsche Club GB: 1 discussions

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Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

One other point of concern which I have had reassuring advice about- I showed the car some hard use of the brakes. I noticed whilst cleaning that some spidery cracks had appeared around the drilled holes on the centre two rows of vents on the front discs. I have been advised that under 5mm in length is tolerable, anyone else had any similar experience or have any advise to offer? The discs/pads are OEM for the record.

POST 2Original post

To quote the manual: Perforation starter cracks arise through material fatigue due to [*] frequent and extreme heat elongation fluctuations. These fluctuations [*] in the disc temperature, which generally arise in racing [*] conditions, tear the friction plate perforations in a radial direction [*] due to material fatigue (changing heat elongation conditions). [*] For their part, these starter cracks allow a partial [*] relaxation of the friction plate, so that the speed at which the [*] cracks develop is very slow. [*] The maximum permissible perforation crack length is 5 mm. [*] The growth of the perforation starter cracks or a tearing of the [*] rim of the friction plate worsens the smoothness of braking, [*] decreases the disc strength and therefore makes a precautionary [*] parts replacement necessary.

POST 3 / ORIGINAL POSTEROriginal post

Thanks for the reply Richard. Are the cracks likely to be through the disc or just surface cracks? I am hopeful they are the latter and may disappear with normal use of brakes. Your views and experience please? Cheers

POST 4Original post

Wishful thinking I'm afraid - I don't think they will disappear with use. If/when they exceed the dimension shown - replace them.

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