Originally Posted by schmieg
That's possible. Now that I think about it, it does sound similar to noises my old Tahoe made when trying to stop on icy roads. Just never heard it in the Jeep and on a dry road on a sunny, warm day, the ABS never entered my mind.
Early ABS systems used to freak people out.
There were often news reports where they would assure people that the rumbling, vibrating and "boulders rolling around" feel was actually the system doing its job.
My advice to anyone upon getting a new car from a brand they've never owned before is (once the break-in period for the pads and rotors is over), take the vehicle to an empty lot and perform an emergency stop. Get the vehicle up to about 35-40, then slam on the brakes completely and don't let up no matter what until fully stopped.
That way, when you need to do that for real, you won't be freaked out by the sound or feel and potentially let up when you should be letting the system do its job to stop the vehicle.
Every system is a bit difference, so no manufacturer will feel or sound exactly the same.