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Discussion summary
YOUR RESEARCHClutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Use ate 200 fluid
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
The shop only flushed the brakes - not the clutch - and used ATE 200 fluid.
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed work
Repair shop flushed the brakes and not the clutch
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Honestly, I am not sure, but since you mention that the noises started after the repair shop flushed the brakes and Not the clutch, it could be an indication, at least after you flush the slave you will know that all the hydraulic system has fresh fluid..
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Use ate 200 fluid' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'flush will be' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Repair shop flushed the brakes and not the clutch' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
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.
Suspected cause · Original poster
Just wondering how likely the flush will be to fix the issue.
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Repair shop flushed the brakes and not the clutch
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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
Honestly, I am not sure, but since you mention that the noises started after the repair shop flushed the brakes and Not the clutch, it could be an indication, at least after you flush the slave you will know that all the hydraulic system has fresh fluid..
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use so you buy the same type
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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
You could flush the master cylinder fairly easy with a 'power bleeder' (I have the Motive Power Bleeder and I am very happy with it), just ask the shop the barnd of fluid they used so you buy the same type
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace clutch itself only has around 14k
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
1
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report an unsuccessful attempt
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.
Unsuccessful attempt · Original poster
The clutch itself only has around 14k on it (car has 32k, clutch was replaced early when IMS was done) and there is no change in clutch function. The pedal feel is mostly smooth and normal with no change in the engagement point.
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (4)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Repair shop flushed the brakes and not the clutch
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
Honestly, I am not sure, but since you mention that the noises started after the repair shop flushed the brakes and Not the clutch, it could be an indication, at least after you flush the slave you will know that all the hydraulic system has fresh fluid..
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace clutch itself only has around 14k
No successful repair reported for this finding.
0
Reported fixes
1
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report an unsuccessful attempt
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.
Unsuccessful attempt · Original poster
The clutch itself only has around 14k on it (car has 32k, clutch was replaced early when IMS was done) and there is no change in clutch function. The pedal feel is mostly smooth and normal with no change in the engagement point.
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use so you buy the same type
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
You could flush the master cylinder fairly easy with a 'power bleeder' (I have the Motive Power Bleeder and I am very happy with it), just ask the shop the barnd of fluid they used so you buy the same type
Clutch Master Cylinder Squeak - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi All -
I've been lurking around the forum for while but this is my first time posting. I am looking for some advice on an issue I've been having with my clutch. Specifically my clutch master cylinder makes a squeaky sound when the pedal is depressed/released. I verified that the sound is indeed coming from the master cylinder - it is not the mechanical creak that can sometimes emanate from the helper spring or clutch pivot points. The clutch itself only has around 14k on it (car has 32k, clutch was replaced early when IMS was done) and there is no change in clutch function. The pedal feel is mostly smooth and normal with no change in the engagement point. The only time I think I can feel slight resistance is when feathering the clutch, but this is very minor. The problem seems to have started after a brake flush at a local, reputable Porsche shop. The shop only flushed the brakes - not the clutch - and used ATE 200 fluid. I've read that 9X7 gen vehicles can get master cylinder squeaks when non low viscosity fluid is used, but the LV fluid doesn't seemed to be specced for the 986. Obviously the squeak and flush timing could be completely coincidental. Has anyone else seen this before or have any advice on what to do? Any help is greatly appreciated. Thanks!
Here is a video of the issue:
https://www.youtube.com/shorts/BxRF9DygKUA
You could flush the master cylinder fairly easy with a 'power bleeder' (I have the Motive Power Bleeder and I am very happy with it), just ask the shop the barnd of fluid they used so you buy the same type
The clutch and brake systems share the same recptacle, and according to the shop manual, you leave the pedal at the floor and flush it for 20 seconds (..!), afterwards you manually pull the pedal up and should be ready to use..
Good luck!
Thanks, yeah I figured that would probably be my next step in trying to fix the issue. Is a squeaky master cylinder a common problem with old clutch (brake) fluid?
Honestly, I am not sure, but since you mention that the noises started after the repair shop flushed the brakes and Not the clutch, it could be an indication, at least after you flush the slave you will know that all the hydraulic system has fresh fluid..
Thanks yeah, i guess that's the best way to proceed. Would it be a bad idea to flush with LV fluid (ATE SL.6)? I'm pretty sure it is compatible with ATE 200. I guess the only thing is I'd have ATE 200 in most of the brake system, then the SL.6 in the clutch lines. The mixing would dilute the LV feature but maybe resolve my issue?
First of all, to my knowledge, LV brake fluids are not recommended for pre 2005 Porsche vehicles.
I would suggest getting some fresh ATE 200 and access to a Motive bleeder and flush both your brakes an clutch systems until whatever fluid is in there is gone from the common fluid system they share. The Motive system is particularly good for these types of flushes as it pushes new fluid to force out the old.
Thanks! Sounds like bleeding the clutch is the next best course of action to see if the squeak goes away. Will give it a try and update with results!
Out of curiosity, have you known a squeaky clutch master to be caused by old/dirty fluid? Just wondering how likely the flush will be to fix the issue.
