Originally Posted by david1,Jun 28 2004, 09:17 PM

When I had my shop, I had a 5 series BMW do exactly what you described. We put rear calipers pads and rotors on it and the car came back the next day with the same problem. Turned out the ABS computer was faulty (no codes) and was making the abs pump keep uneven brake line presure to each side on the rear. This would confuse the computer even more and then It would pulse one of the rear brakes because the speed sensor one one side was pick up a different rotational speed. This might be the noise you hear. I know it sounds way out there, but a new abs computer fixed it. I ate the cost of it to keep the customer happy and the BMW dealer made me grab my ankles for the diagnosis since the tools for ABS diagnosis was still only at the dealership level at the time.

Or, could be a broken pad which I have seen before also.

Originally Posted by OhioRacer,Jul 7 2004, 12:08 PM

Huge props to Dave for nailing this one. ABS computer freaked out. Problem appears to be solved. They put new rear pads on but the brakes sure seem squishier and I seem to have to push the pedal farther to brake. Hmmm...

Originally Posted by david1,Jul 7 2004, 01:36 PM

Sounds like you need bleed. Also, if the pad composition is different, you will have a different feel through the pedal. It may start to feel better once the pads bed to the rotor.