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Discussion summary
YOUR RESEARCH996 brake rattle
Leading reported evidence
Replace pads
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
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Discussions that contain suggestions
1
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Performed · outcome unconfirmed
On my Porsches I have always changed pads when I start feeling brake performance degrading rather than when the sensors go off.
Leading evidence: 'Replace pads' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'waste of time, and (b) trying' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check brakes yourself' (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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Suspected cause
Trying to turn a rotor that has any kind of warp or other imperfection is (a) probably a waste of time, and (b) trying to salvage a part that shouldn't be saved.
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Suggestion
Hurdigurdiman's advice is good if you want to tackle checking the brakes yourself.
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Suggestion
The Zimmerman and Balo rotors are pretty darn cheap - if it DOES turn out to be a rotor, just replace the rotors on that axle and be done with it.
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Suggestion · Original poster
So I took a fun little drive in the country today, found about a 10 mile run of seriously curvy roads.
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waste of time, and (b) trying
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
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Reported fixes
Read evidence and context
Discussions that suspect a cause
1
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Suspected cause
Trying to turn a rotor that has any kind of warp or other imperfection is (a) probably a waste of time, and (b) trying to salvage a part that shouldn't be saved.
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.
16 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So I took a fun little drive in the country today, found about a 10 mile run of seriously curvy roads. Under hard braking the front brakes sounded almost as if they were rattling. Could this be the rotors in need of turning/ replacing or could it be something more serious?
If the rotors are warped or uneven, I'd think you'd feel it in your foot/brake pedal or the steering wheel as opposed to rattle. Check to see that the spring steel retainer that puts down pressure on the pads hasn't broken or isn't missing (this piece goes under the pin that holds the pads in the).
Go on you tube and find how to remove front brake pads. The caliper comes off and you can see everything you need from the video.
https://www.youtube.com/results?sear...xs+996+porsche
lots of video on this job. All easy DIY work.
It is a good rule to treat any noise or odd behavior from something as important as the brakes as a serious problem until this has been eliminated.
Hurdigurdiman's advice is good if you want to tackle checking the brakes yourself. If you do not feel you are up to it then seek out a reputable shop and have a professional evaluate the brakes.
Without experiencing the behavior first hand, but knowing how trouble free these brakes are -- though there are always exceptions which is why you or someone needs to check out the brakes just to be sure -- my WAG is you were possibly feeling ABS intervention or experiencing some front tire scrubbing arising from how you were driving and from front tires that are probably while not worn hard and getting slick from the heat cycles.
With my Boxster under similar usage I can sometimes feel what I can best describe as very high frequency ABS intervention but it is not ABS. It is at least one -- the inside one no doubt -- front tire scrubbing under sharp and relatively high speed turns.
I did feel it in the pedal and wheel as well, should have mentioned that I guess. It wasn't ABS, Im assuming the rotors were just warped but ive never heard warped rotors rattle like that.
I'm not sure what is wrong with your brakes, but I had a pulsing sensation in the wheel and it would not brake straight when my rotors on my Touareg were warped. On my Porsches I have always changed pads when I start feeling brake performance degrading rather than when the sensors go off. I just dont like the feel of worn pads.
The braking system in these cars is very problem free, but I would have your system looked at. What condition are your rotors and pads in? How many miles does your car have and when was the last brake service.
I believe you probably could remove a little bit of material by Blanchard grinding or double disc grinding.
Here
is a good thread on Rennlist about machining cross drilled rotors. We have a brake pad DIY
here
and a brake rotor DIY
here
if needed, which provides a lot of great detail about rotors and measurements, etc.
The only time you should feel a rattling sensation from the brakes is when ABS is engaged. If you were not braking hard enough to engage ABS, you may have a cracked rotor or other surface issue. While warped rotors are far less common than the Internet suggests, this _might_ be the case.
It's also possible that you have a bearing issue that becomes more pronounced under braking. Until you have jacked up the front end and confirmed that the bearings are in good shape, starting to throw money at the brakes may be premature.
The rotors should wear evenly - so you should never wind up with a warped or out-of-balance rotor when the brakes are functioning correctly. Trying to turn a rotor that has any kind of warp or other imperfection is (a) probably a waste of time, and (b) trying to salvage a part that shouldn't be saved. The Zimmerman and Balo rotors are pretty darn cheap - if it DOES turn out to be a rotor, just replace the rotors on that axle and be done with it.
I did have the local auto parts store turn my rear rotors - they measured well within spec and were not warped - but if I did it again I would probaby replace with new ate rotors (to save money) or sebros if you want german steel ....
