Service Bulletin 34.08.01 ABS brakes

[RedbeautyIS]

OK 2000 328i E46 had rear trailing arm with bearing changed on car due to a severly fried rear bearing. Since I have not had a job in a while I chose to buy the trailing arm from the net used (saved around $700 ) and it is a casting so I thought it would be alright. Arm came in with sensor and bearing installed, sensor was replaced but bearing was used as is. Well as soon as I picked it up after replacing all rear brakes and, wear sensor and pulse sensor I get an ABS rattle when stopping. It does not matter if I brake hard or easy and it does not seem to affect the braking until nearly stoppedwhen I can feel the car dive as if the rear brakes let go. The service bulliten sas it could be; sensor wiring, sensor, pulse wheel or contanination. Has anyone experienced this problem? It's making me crazy and I cannot afford an expensive stealership billright now.

Goodluck everyone.

[Hootie]

Sorry Red, haven't heard of this and never experienced it. PM 325isbaby for another opinion. Definitely sounds like something computer or sensor related though, as it doesn't occur at all times and under all conditions.

[Dirty_Tool]

Try putting your old sensor back in if you still have it. Otherwise it is probably a bad bearing. common sense would tell you that if it just started happening immediatley after changing these 2 items then 1 of them must be the culprit.
Good luck

[RedbeautyIS]

I agree with change the bearing however can I get cleared up on one point. Does the sensor enit a steady signal that gets reflected off a gear or sprocket or does the sensor only time the individual wheel speed and compare in the puter. As you can see I am clueless as to the origination of the signal back to the ABS computer.

thanks

[Dirty_Tool]

I belive on your year model it uses a hall sensor which picks up a signal from a pulse wheel built in to the bearing. The sensor sends this info to the DSC (traction control and ABS Module) and then the DSC module can share this information with other modules such as the instruments cluster trans module (if equipped) etc.

[325isBaby]

Correct DT...and just to let you know Red, I've worked at the dealer for quite some time now, and to be honest I had to look up that bulletin when you posted your concern...I don't believe I've ever used this bulletin!! Hope this puts your mind somewhat at ease

[RedbeautyIS]

is the bulletin real? If so can you tell me what it would cost to diagnose it. The bulletin says that the root cause will be either 1. sensor wiring, 2. sensor, pulse wheel or 3. contamination. Do you know if 2000 328i sedan has a built in pulse wheel in the rear wheel bearings?

[RedbeautyIS]

BTW 325is Thanks much