15 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHelp!....PSM and ABS warning light
Leading reported evidence
Install about 18 months ago by jzm
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
No.steering is fine as had a new steering rack fitted about 18 months ago by JZM.
Leading evidence: 'Install about 18 months ago by jzm' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install about 18 months ago by jzm' (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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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Had the master cylinder and brake pipes replaced earlier this year..
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Discussions that contain suggestions
1
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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
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Suggestion
Either get a Porsche tester plugged in or use some old school methodology to diagnose where the problem is.
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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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.
Outcome without a verified action link
Removing the fuse just disabled any ABS/PSM braking, thus making the car driveable until I had it fixed.
Car been parked up overnight and drove 100 metres from home when brakes locked up, steering went heavy and I came to a standstill as if I applied the brakes heavily. Both the PSM and ABS warning lights are on. Luckily I managed to get it back home with a struggle! Anybody got any ideas please? :?:
Thanks!
You have a fault with the monitoring system by the sounds of things. If any of the wheel sensors are giving incorrect readings then the system will actuate the "what it thinks" necessary measures, i.e. drop power, actuate brakes, etc.
Either get a Porsche tester plugged in or use some old school methodology to diagnose where the problem is.
A few questions ..
Have you had any work done on your car recently ?
Did you just drive on a straight road at normal speed or did you throw it into a round about or a corner which may have activated the PSM ?
Did you use the brakes whilst this happened ?
Did it feel to you as you struggled home that the brakes were binding or being applyed ?
reason for questions ..
I have once come across a problem with a C4 and ONLY a C4 with brakes locking on .. its as rare as hens teeth so i dont want to go into it atm untill i have a little more info as it will lead you up the garden path so to speak .
Im also thinking steering angle sensor calibration is out .. but you need to have had geo work done recently for it to be this ..
Yes I have when it was in storage...amongst other things, real wheel bearing and disc skimmed. I was only about 150 metres from home after reversing off the drive and heading in a straight line. I did not use the brakes ...it felt as though the brakes had been applied then remained on! The brakes appeared to be fully applied on the way home. The new steering rack was calibrated when fitted.
Steering rack was a long time ago so thats out .. you have had work done .. ie a wheel bearing so was this the first trip out after this work ?
Sounds like something is binding a wheel and not what i first thought .. you have to have PSM activated to cause this issue and thats a master cyl fault .
You need a fault code read out and jack up each wheel in turn to see which ones are binding.
When I had a fault on mine the rear RH caliper kept braking causing problems driving it and a hot rear RH disc. Removing the fuse just disabled any ABS/PSM braking, thus making the car driveable until I had it fixed.
