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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCH987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
Leading reported evidence
Use on 996 gt2 and gt3 models
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
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 · Original poster
This was used on 996 GT2 and GT3 models from the factory.
987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
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Leading evidence: 'Use on 996 gt2 and gt3 models' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace coding' (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 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 · Original poster
This part was also used on all 996 Carrera and Turbo models.
987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
Use on c4, targa4, and gts models
Performed · outcome unconfirmed
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 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 · Original poster
This unit was used on C4, Targa4, and GTS models with PCCB, as well as C4S, Targa4S, and 997 Turbo regardless of braking package.
987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
Replace coding
Suggestion or failed attempt
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 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 did try changing the coding on my ABS pump with PIWIS but it couldn't write it successfully.
987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
Run into this issue and was it servo the cause
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 · Original poster
Has anyone run into this issue and was it servo the cause?
987/997 ABS problems, ICE mode - Page 1 - Porsche General - PistonHeads UK
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.
2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
I've got a 2007 987 base, recently upgraded the brakes and have been suffering what seems to be known as ice mode, where the ABS activates too early but doesn't actually do much, pedal goes hard and vibrates but it's not retarding any speed, come off the brakes and back on and it stops fine. This also happens on lose surfaces with minimal brake pressure causing it.
My brakes consist of larger 8 pot calipers up front and rear 4 pots with larger pistons so I'm moving more fluid. I added in a GT3 master cylinder at the same time also.
I did try changing the coding on my ABS pump with PIWIS but it couldn't write it successfully. Has anyone ever done this successfully?
I've seen some suggestions that this could be due to the brake servo now not being sized correctly. Has anyone run into this issue and was it servo the cause?
I've seen this list on another forum with the various versions, does anyone know if these are all straight bolt on upgrades? I guess I'd go for the last one, the 997 GT version.
98735592300 is the standard 987 booster for all cars with steel brakes. This includes Cayman R and Boxster Spyder.
99635592300 is the 987 booster for all PCCB cars. This part was also used on all 996 Carrera and Turbo models.
99635592390 is the 996 GT booster. This was used on 996 GT2 and GT3 models from the factory.
99735592300 was used on 997 Carrera 2, C2S, Speedster, and Sport Classic models (both PCCB and steel rotors).
99735592320 is the booster used on 997 Carrera 4, Targa4, and GTS models without PCCB.
99735592537 is another 997 booster number. This unit was used on C4, Targa4, and GTS models with PCCB, as well as C4S, Targa4S, and 997 Turbo regardless of braking package.
99735592390 is the 997 GT booster. This was used on all 997 GT3, including the RS 4.0, as well as all 997 GT2, including the RS.
I'll answer my own question in case someone else finds it on a google search. A GT brake servo has fixed my issue. The part number I bought was 997.355.923.91
P6251372
Little video on the topic.
This is a source reference. Confirm exact model applicability in the original material.
