6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBrakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace about a year and a half ago prior
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
All the brake components are good as far as I know, I do use a power bleeder and everything was replaced about a year and a half ago prior to a PCA event in NH.
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Replace about a year and a half ago prior' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'master cylinder too' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check high current abs fuse - (f1)' (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
and I have changed the brake fluid on this car several times before in preparation for PCA Drivers Ed events.
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
master cylinder too
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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 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.
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check high current abs fuse - (f1)
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
Have you checked the High Current ABS Fuse - (F1) on the Current Distributor?
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace brake hardware (pins, shims, etc.) in addition
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
At the last Pad change, did you replace the Brake Hardware (pins, shims, etc.) in addition to the Pads?
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace about a year and a half ago prior
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 · Original poster
All the brake components are good as far as I know, I do use a power bleeder and everything was replaced about a year and a half ago prior to a PCA event in NH.
Brakes Locked Up... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use power bleeder and everything was
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 · Original poster
All the brake components are good as far as I know, I do use a power bleeder and everything was replaced about a year and a half ago prior to a PCA event in NH.
Brakes Locked Up... - 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.
6 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The brakes on my 97 Boxster are locked up solid. The peddle feels like it is welded to the car it is so hard, no play at all.
I am going to get into it a little deeper this weekend and I am not a novice at working on cars - SCCA and PCA racer, mechanic, etc. and I have changed the brake fluid on this car several times before in preparation for PCA Drivers Ed events.
Has anyone else experienced this situation? What did you discover?
Thanks for any help, I've always been able to find knowledgeable people on this forum.
Steve
Hi,
Of course, my first suspicion is the Master Cylinder, especially on a '97. Where is your Fluid level at? What is the approx. dimension of remaining Pad material and the Rotor dimension? When you swap fluid, do you use a Power Bleeder or the traditional
Press the Pedal and Release
method? When was the Fluid last changed? At the last Pad change, did you replace the Brake Hardware (pins, shims, etc.) in addition to the Pads? Have you checked the High Current ABS Fuse - (F1) on the Current Distributor? The ABS Control Module Fuse (B9) in the Fusebox?
I think the problem lies somehwere in the answers to these questions. At least it's the right place to start. Good Luck! Keep us informed...
Happy Motoring!... Jim'99
Thanks Jim,
Do you know exactly what the fuses do and what effect they would have on the current (pardon the pun) situation?
All the brake components are good as far as I know, I do use a power bleeder and everything was replaced about a year and a half ago prior to a PCA event in NH.
This happened quite unexpectedly. Unfortunately my wife was driving the car at the time so I don't have first hand knowledge of the symptoms prior to lock-up. I drove the car the day before she did and everything was fine.
I discovered the problem about a week later when I tried to take the car out of the garage. Then she tried to explain to me what happened. She said the brakes siezed for a moment as she approched a traffic light, but that was it.
I'm suspect the master cylinder too.
Thanks,
Steve
Hi,
@SteveHMaine, The highest likelyhood is that the Master Cylinder has gone the
way of all flesh
. The MC is actually made by Lucas and a generic part is available, probably saving some dough. The Lucas PN# is PMK483 (32066700) and is a direct cross-link to Porsche PN# 996.355.910.00
But, the F1 Fuse is a High-current, 50Amp fuse (think Fusible Link). It's located in the Current Distributor which is mounted on the Firewall on the passenger side. You need to remove some of the footwell trim to access it. It is sealed with a label to prevent unauthorized access. The Fuses are mounted using 5mm nuts and run (L-R) F1-F7. The F1 Fuse handles all the ABS hardware - Pump, Modulators etc. I'm not certain, but the default mode (Blown Fuse) could well be to lock-up the system as a safety feature. Since the issue as you describe it appears to be intermittent, my suspiscion is not so strong on this being the cause. You'd want to pull the link (F1) and test it for continuity.
The B9 fuse is located in the 2nd row of the ATC Fusebox. It's function is to regulate power to the ABS Module (Brain). Again, I don't what (if any) default mode exists. If these fuses, and all the other Brake system items mentioned earlier, check out, then I'd start suspecting the ABS Module for improper function. Keep us informed - Good Luck!...
Happy Motoring!... Jim'99
that's why I go to them, they charge $120 labor per hour, but you get what you get, my car is like brand new. I told you all about how I got a deal, when I was charged for a minor service and got major service. The car is a dream and just think, 50,000 miles til the next major change. (Although they say every 2 years, uh huh =)
This is a source reference. Confirm exact model applicability in the original material.
