Brakes pulsating!?!

[gardjea]

Had the same issue with my 986 S ... when breaking with a road surface no perfect ( kind of small waves) the ABS was reacting in a strange way . With my new 987 it seems that thy corrected this issue .
JMG

[Perfectlap]

I've driven many cars and none ever felt this way (like a rock was stuck in the rotor). Does the PASM bypass ABS? Or is there any way to switch off the ABS and allow locking up? I'm only interested in doing this when driving competitively.

By the way does anyone know of a good link that explains the Porsche ABS?

[Jeannot]

PASM? You talk on a 987 here or are you talking 986?

[Perfectlap]

PASM for 986

[JonnyBGood]

I think what you're describing is the ABS. This year in the snow is the first time I"ve had it do that to me and really only when I KNOW the wheels are trying to lock up.

It does feel wierd though. Its an uneven pulsing as if the wheels are going to fall off. I have had other cars and this is the first one that seems to feel uneven when it pulses.

I don't think I'd worry about it. I definately think its the ABS

[gardjea]

I defintly think this is the ABS effect . On the 987 you could select the sport mode . it then push the limit of the PASM and ABS to react later ( really good when driving sportly ) You could also disconnect the PASM .... but it will automatically switch on if the computer detect the car is really in a bad situation ...

[Brucelee]

Simply go out on a deserted road and do a panic stop from say 30 MPH. The ABS will come on and you will know what the ABS feels like. It is unmistakable I believe and will let you know if what you experienced was the ABS.

Whether that is what SHOULD have happened is a judgement call on your part. You can chat with your local service tech also to support you own call on this.

Let us know how it all turns out.

Good luck!