Easiest way to tell would be to disconnect the ABS/DSC module (under the hood, left side), start the car, and see if the pulsing goes away. If it is an issue with the module there are several options out there for rebuild (or replacement). This process will turn on the ABS, DSC, and BRAKE fault lights, but re-connecting the module should turn them off. Make sure that the ignition is OFF when messing with the electrical connection to the module, or better yet, battery negative terminal disconnected.
I found this mentioned in another car thread when searching on Google. Definitely worth looking into also. Are you saying the squeal from my rear parking brake would also be related to the wheel sensor? or just the thump?I had the same symptoms when a wheel sensor was going out.