15 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Turbo ABS Low Speed Slipping??
Reported or suspected cause
brake pedal switch
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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Reported cause
It turned out to be a faulty brake pedal switch, which cost all of about €10 to fix (I was in Germany at the time).
Leading evidence: 'brake pedal switch' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'brake pedal switch' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check code' (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
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Reported cause · Original poster
That's why it's a pain in the a** - the problem is intermittent so dropping into the shop for diagnostics is a bit of a game of capture the right moment...
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Performed · outcome unconfirmed · Original poster
Steve @ Jaz in Wembly who has been brilliant has checked the the code on the diagnostic computer.
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Performed · outcome unconfirmed · Original poster
We also replaced the ABS unit/pump as it is one and the same.
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Performed · outcome unconfirmed · Original poster
I'm not convinced as he ran an impedance test which came up clean.
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Suggestion · Original poster
The only other thing he can suggest is replacing the entire wiring loom which is a big job as their maybe a breach somewhere which throws up a bad input.
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Reported cause · Original poster
That's why it's a pain in the a** - the problem is intermittent so dropping into the shop for diagnostics is a bit of a game of capture the right moment...
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15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Hello,
I have a 2001 996TT. Had all pads and discs done under 750 miles ago. Minor service done at the same time. Recently, only at slow speeds just before it comes to a stop (mostly happens on a slight incline) the ABS feels like its kicking in for no apparent reason. I can feel it through the brake pedal and hear it too. Other than that it stops just fine and oddly, if I am braking from speed, it never seems to happen.
Any bright spark have an idea what is going on here? :?:
For it to do that the ABS ECU must think it is losing traction on one or more wheels. I would say the unit requires a reset to re-calibrate it.
Unsure to be honest on how to perform this. I am sure it will require a PIWIS (Porsche workshop computer) to explore and reset values.
I bet, according to the brain it has wheels travelling a different speeds when under 20mph.
Lets see what Richard H thinks.
Where are you in the UK, you might be close to someone on here who has got access to the PIWIS
Ha Ha! Long time reader first time poster and all that!
I have to say, I was thinking along the same lines so it's good that you concur. Great minds think alike (or fools never differ as my misses says?!)
Am I right in saying it's not a major problem, more of an anomaly?
I'm in South West London BTW.
Richard is South and possibly worth the journey for his knowlege, he is bound to make comment in here soon.
I would say you have nothing to worry about. I would rather have paranoid ABS than none at all. It seems what you have is a common problem amongst all manufacturers, cutting in at low speed for no reason.
Fingers crossed it is a simple reset.
There isn't any recalibration routine in the PIWIS for PSM/ABS AFAIK.
I get the same thing occasionally on greasy surfaces, when I get down to what seems like walking pace. I used to get it on the C2 as well, and even more so with the 993. Maybe it's our driving style! :dont know:
Does anyone else experience it?
Obvious things to check would be tyre pressures and tread depths. I doubt if it's a system fault, but I'd be happy to check the fault memory for you if you are passing by this way.
Interesting.
Tyre pressures is a good point, had one car one time in band camp that had the wrong profile tyre on one side.
My ABS cuts in when braking over manhole covers at slow speeds but otherwise perfect
I know it's been a long time since the last post on this but I have been trying to solve this issue for a while now and still no joy.
Steve @ Jaz in Wembly who has been brilliant has checked the the code on the diagnostic computer. It read that there was a unexpected (or impossible - something like that) input from the front left wheel sensor under breaking. We have replaced the left wheel sensor which admittedly did look worn out. Problem came back. We also replaced the ABS unit/pump as it is one and the same. No joy.
The ABS and TC lights come on towards the end of every journey and the break pedal shudders as before. It's now spoiling the enjoyment of my drive and, heaven forbid, I'm starting to think negative thoughts about my turbo.
The only other thing he can suggest is replacing the entire wiring loom which is a big job as their maybe a breach somewhere which throws up a bad input. I'm not convinced as he ran an impedance test which came up clean.
I asked if it was a cracked ring as suggested but he dismissed this - I'm not sure why, but then he is the expert not me. Is that something that can be seen just by taking the wheel off? If not I'm not sure how he came to that view.
Please, anyone, any ideas?? It's driving me mad! Any views on where I should take the car to be cured? I've already forked out a fair amount of cash to resolve this and am cautious about further investigations which don't go anywhere.
As ever, i'd really appreciate any help. Thanks!
Had this recently on my daily (S4 Avant so also 4WD). The front left was locking up slightly when braking from walking pace.
A friend hooked me to his laptop whilst I showed him the symptoms. His diagnosis was correct before we even tested it. The
rear
left senser (O-ring I think he called it) was cracked and giving faulty readings which could easily be seen on the diagnostic software.
And this was causing the front left to compensate. So perhaps changing the sensor where the problem is may not be getting to the nub of the matter.
Think "SportsandClassic" is talking of the same sort of thing.
Hi - I have an '04 turbo with similar - low speed braking if I am reasonably hard on the brakes, there is a noise from the pedal and it feels very much like the ABS is engaging. I seem to sense it when I have been over speed humps and then brake afterwards.
Ok, so is an 'inductive ring pick up' different to the speed sensor? I take it even if the diagnostic computer points to the front left being the issue that it might actually be elsewhere? Ought I change the back sensor too?
Or even the right side?
To give some more info, the abs and pcm lights come up at one point during the journey but not necessarily just after braking. I could be cruising quite happily and they'd pop up. Turn the car off and they'll disappear. Next trip, back they come. That's why it's a pain in the a** - the problem is intermittent so dropping into the shop for diagnostics is a bit of a game of capture the right moment...
I thought the warning lights might be a standalone MAFF problem but it's not. Had that checked and absolutely no loss of power anyway.
I'm determined to get to the bottom of this!
Even if it means going to an OPC...
This may not help at all, but I once had a similar problem on my C4 with PSM and ABS lights flashing for no reason at slow speeds (can't remember whether I also had the ABS sensation). It turned out to be a faulty brake pedal switch, which cost all of about €10 to fix (I was in Germany at the time).
Gents,
Sorry to jump in on your thread, however my car has just started doing something similar but not the same.
As i brake for a corner and start to turn in I get a judder or it feels like the ABS is flicking on for a split second and the wheel sticks. The light also comes on. Now it seems to do this only once when I drive it. For instance i drove the car 25 miles last night and it only did it only in one corner. However, it has done on the last 3 occasions.
Any ideas? it does sound very similar to your slow speed problem?
Thanks
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