Brakes pulsating!?!

[Brucelee]

This might help!







Both Boxster models are equipped with Porsche Stability Management (PSM) as standard. While it cannot overcome the laws of physics, PSM can provide additional control in difficult driving scenarios.

Here's how it works: When the new Boxster is in motion, PSM monitors the car's direction, speed, yaw velocity (speed of rotation around the vertical axis) and lateral acceleration. Based on this information, it can then calculate the actual direction of travel. If your Boxster begins to oversteer or understeer, PSM applies selective braking on the individual wheels to help bring it back into line. If the wheel approaches the threshold of skidding under braking, PSM uses a modified ABS to shorten the braking distance.
If you're accelerating on wet or other low-grip surfaces, PSM uses the integrated ABD (automatic brake differential) and ASR (antislip regulation) functions to help maintain traction and stability.

When 'Sport' mode is selected on the optional Sport Chrono package, the PSM threshold is higher, allowing greater driver involvement. If you'd rather enjoy your Boxster unassisted, the system can be set to standby at any time.

To enhance your safety, PSM remains present in the background and will only intervene under heavy braking where both front wheels are being controlled by ABS. All PSM inputs are more restrained and more precise, thus preserving the natural agility of the car. Although driving in a safe and prudent manner is the driver's ultimate responsibility, PSM does provide an extra margin of safety whenever you need it most.

[Perfectlap]

sorry I should have clarified I hace a 2000 S which doesn't have PASM.

I'd like to see if there is a comprehensive analysis of the Porsche ABS system.

And tips for preventing its need. I was always told that with ABS you wanted to pump the brakes which is completely the opposite of what I have trained myslef to do. For instance in autocross I'm often "quick hard and quick off" the brakes before making a fast turn. It was a trick to do this without locking up the brakes with my old Miata. With ABS its going to be another challenge.

[Lux]

Whoa, stop right there (no pun intended)!

You DO NOT want to pump the brakes on an ABS-equipped car. The ABS does the "pumping" for you. And about your technique of locking up the brakes...that is also a no-no. When you lock up the brakes, you are sliding. And if you are sliding you do not have control. Try locking up the brakes and then turning (actually, don't try it). You won't be able to turn. That's why ABS was invented. I would suggest finding an empty parking lot and doing some full stomps on the brake pedal to get used to the ABS activating.

[Brucelee]

Don't pump the ABS. That is the cardinal rule. Stomp on them hard and keep the pedal down. The ABS does the rest.

[Perfectlap]

that's right pump the brakes for non-abs. Got it backwards.
Locking up the brakes isn't really a technique, more like an unexpected situation that is fairly common when really braking hard. Usually when you brake too late and stay on the brakes too long.
I had an instructor at a very challenging two day AutoX driving school braking so hard I thought he was going to put his foot through the floor board. yet he never locked up. A very violent feeling experience as a passenger.