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Fitting GT3 Master cylinder or Dual Master cylinder on 996

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17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHFitting GT3 Master cylinder or Dual Master cylinder on 996

Leading reported evidence

Use motul

Performed · outcome unconfirmed

No successful repair reported for this finding.

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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.

Performed · outcome unconfirmed

I'm using Motul with PFC 08 in front and 01 in the rear this year.

Fitting GT3 Master cylinder or Dual Master cylinder on 996
Frequently discussed work

Use castrol srx, and performance friction brake pad

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Discussions that contain suggestions
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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

Then I just purged and use castrol srx, and performance friction brake pad, and that was it.

Fitting GT3 Master cylinder or Dual Master cylinder on 996
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Leading evidence: 'Use motul' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use castrol srx, and performance friction brake pad' (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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1 matching discussions · 17 captured posts examined · 0 partial discussions

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Use castrol srx, and performance friction brake pad

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

Then I just purged and use castrol srx, and performance friction brake pad, and that was it.

Fitting GT3 Master cylinder or Dual Master cylinder on 996
Frequently discussed actions (2)

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

Use castrol srx, and performance friction brake pad

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

Then I just purged and use castrol srx, and performance friction brake pad, and that was it.

Fitting GT3 Master cylinder or Dual Master cylinder on 996

Use motul

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

I'm using Motul with PFC 08 in front and 01 in the rear this year.

Fitting GT3 Master cylinder or Dual Master cylinder on 996
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.

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

  • Rennlist: 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: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Has any fitted a 996 C2 with a GT3 Master Cylinder? Does it work? Direct bolt-on? How about a dual Master Cylinder? Please give details. thanks!

POST 2Original post

What would be the reason for wanting to do this? Do you have larger brakes?

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 10372606

It is for my race car. I want a firmer pedal.

POST 4Original post

I've felt that there isn't enough bite instead of the pedal being to soft. For how stiff the pedal feels I feel like the brakes should bite a lot more than they do. That's one of the few issues I have with the car.

POST 5Original post

I have had soft pedal at a time and I was going crazy on steel braided lines, master cylinder, cooling duct... Then I just purged and use castrol srx, and performance friction brake pad, and that was it. That's all you need. I mean I get perfect pedal feel, as long as I want to. I don't even think about fading anymore. what brake pads are you using ? what brake fluid are you using ? I assume you tried to flush it already ?

POST 6Original post

I would recommend pressure bleed followed by SS lines first as the cheaper alternative if you haven't already tried it.

POST 7 / ORIGINAL POSTEROriginal post

Quotes source post: 10374470

I have done this.

POST 8Original post

Quotes source post: 10374379

I value your opinion, so I googled castrol srx and don't pull up much. Can you clarify? What performance friction brake pad are you using?

POST 9Original post

I think philooo mistyped and meant to say Castrol SRF. (I assume he'll correct me if I'm wrong.)

POST 10Original post

Spot on David.........surely SRF. I'm using Motul with PFC 08 in front and 01 in the rear this year. The past few years I've used Carbotech RP2's and had a mushy pedal at the end of the sessions. I really hope the PFC's fix the issue.

POST 11Original post

I have run PFC 97's the last two seasons wit ATE Super Blue and no brake issues. But since 97's are discontinued, I'll be moving to a combo like Pete's sometime soon. FWIW a buddy with a 964 moved from Super Blue to SRF and it significantly helped a soft pedal.

POST 12Original post

Not exactly what you were looking for, but close (gt3 cylinder in a cayman): http://sharkwerks.com/porsche/987-ca...-flywheel.html In the end though, I agree with others. The system when outfitted with good fluid and pads is pretty damn capable.

POST 13Original post

Yes sorry typo castrol SRF I really push my car pretty hard. before the bleed with SRF it was just scary in fast turn, never knowing where the pedal was. I DID add the front gt3 brake cooler at the same time so may be they made a difference but I doubt it. The brake pads I am using PFC 06, they make all the difference in the world Last time I was lazy and did not want to switch the pads, so I had the OEM street pads and the castrol SRF -> epic fail... mush pedal after a few session. PADS PADS PADS what pads are you running. Homestead has some pretty strong braking lines from 110 to 60 to 45, no problem at all, time after time.

POST 14Original post

BTW..keep in mind for the PFC pads you need to run pretty sticky tires or your pads will overpower your wheels

POST 15Original post

Has anybody try to install the gt3 master cylinder on the base 996 ? I was trying to find something on google but I can't find anybody aside of the boxster boys who have done it ?

POST 16Original post

Funny, I was just reading about this here: http://www.oz951.com/public/emmy.htm#Engine I found the link the the FIsterD/Gundo thread

POST 17Original post

I have not seen anybody documenting a brake booster + brake master cylinder on a 996 on this forum, I am surprised, as this make total sense. I might be looking into that mod.

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