8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHGT3 front brake rotors
Leading reported evidence
Replace with stock or go
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that contain suggestions
1
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Suggestion · Original poster
should I replace with stock or go to larger Brembos?
Leading evidence: 'Replace with stock or go' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace with stock or go' (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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Suggestion
The beveled/counter-sunk casting hole pattern is meant to relieve some stress and help stop the cracks but they are just a fact of life using drilled rotors on a performance sports car.
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Suggestion
The beveled/counter-sunk casting hole pattern is meant to relieve some stress and help stop the cracks but they are just a fact of life using drilled rotors on a performance sports car.
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Pelican Parts: 1 discussions
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Anyone seen cracking front brake rotors (steel not ceramic) on their GT3 (07) with low miles? Mine had 3,600 miles when purchased with no engine abuse as downloaded from the ODB at the local dealer. Still the warranty claim was denied. Any ideas... should I replace with stock or go to larger Brembos? I'll probably only have one or two competitive events a year with the car.
Alan Surgi KTF
Welcome,
small cracks are very common between the holes after a few more rigorous heat cycles from spirited driving. The concensus from even the track folks is that they are nothing to worry about as long as the cracks are not very deep and do not connect the holes. The beveled/counter-sunk casting hole pattern is meant to relieve some stress and help stop the cracks but they are just a fact of life using drilled rotors on a performance sports car. As long as the cracks do not connect the holes and there is no blueing/discoloration of the rotors, then they are probably good to go and have not been over-stressed.
Are you in the PCA Santa Barbara Region? My Dad was president in 1992 and remembers someone by your name. I am going to school in San Luis Obispo at Cal Poly. Are you nearby?
That's me and the old tub!! The new to me GT 3 is a tremendous upgrade from the old school. Hope I'll keep my drivers license and the car for as long as I had the Speedster (35yrs).
Alan
Thanks, it was a huge pleasure to be chief steward of 80034 for 35 years. Now it's replacement is very much an iconic new Porsche to see me into the rest home later. Much later I hope. Still debating the front brake rotor issue.
ALAN KTF
I suggest doing a search in the 911 Technical Forum or the Autocross and Track Racing Forum for this topic. It has been covered numerous times before. Key terms like "Bill Verburg" and "drilled brake rotor cracks" should do it.
