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Discussion summary
YOUR RESEARCHBrakes come on when turning the steering wheel!
Leading reported evidence
Replace steering loom and the steering angle sensor
Performed · outcome unconfirmed
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0
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1
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Performed · outcome unconfirmed · Original poster
I've changed the steering loom and the steering angle sensor which stopped the intermittent problem for a few months, but now its constant.
Leading evidence: 'Replace steering loom and the steering angle sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'just' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace steering loom and the steering angle sensor' (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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Suspected cause
Hopefully the issue is just with the wheel sensors and not anything more expensive that the sensors connect to...
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Suggestion
This is the one condition (brakes applied) where PSM is active even when you've disabled it using the switch.
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Generation: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
Car: 996 C4 Cabriolet 1999 3.4l
This has been an ongoing problem for sometime, first it was rare but now its constant, so any thoughts would be gratefully received.
The symptom is that when driving with the PSM on you turn the steering wheel and the abs brakes come on. Turn off the PSM the abs brakes come on when turning the wheel and applying the brakes. When moving at low speed under 5mph all is ok.
I've changed the steering loom and the steering angle sensor which stopped the intermittent problem for a few months, but now its constant.
Any Ideas??
Thanks Mark
I would guess that there is a problem with the sensor for one of the front wheels; the signal isn't correct and PSM is interpreting it as wheel slip and trying to correct for it.
Even with PSM "off," it is still monitoring for situations when the brakes are applied and there is wheel slippage; it will intervene at times when the brakes are applied even when the PSM Off button is illuminated. This is the one condition (brakes applied) where PSM is active even when you've disabled it using the switch.
A wonky tire size (front/rear mismatch) might cause issues with a C4's viscous coupling, and varying significantly from factory sizes will make the speedo inaccurate, but I don't know how it would cause PSM to do what OP described.
Thanks guys for the responses, Sneaky Pete not sure about the Cheesehead comment, although I do like some Stilton occasionally!
The tyres are different, fronts are 225/40/ZR18 continental sports contact 2, rears are 265/35/ZR18 Hankook Ventus, although the problem was there before the tyres were changed.
5CHN3LL's idea about the front wheel sensor makes sense, I'll take them out and at least clean them. Also French roads (I'm not French by the way!!!) aren't the smoothest in places, which may have upset things
Your moniker made me think you were from Wisconsin...the Badger State which is my home State. Also known as the Dairy State. With Dairy comes cheese and very good cheese too. Wisconsinites are also born Green Bay Packer fans.......us Packer fans like to drink beer, eat brats and cheese curds. After too many beers, brats and curds we don our cheese wedge hats......hence....wait for it.....we are called Cheeseheads. A picture for reference.
Ahhhh Now I understand, you learn something everyday. I'm a Brit, we too like beer, sausages and cheese, although we usually refrain from wearing them on our heads, of course except on weekends! Never been to Wisconsin, but hope to one day, even only to sample the beer.
By my math, your front/rear size variance is within tolerance for the 996. Hopefully the issue is just with the wheel sensors and not anything more expensive that the sensors connect to...
