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Old 10-22-2007, 09:21 AM   #1
jpr
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Join Date: Aug 2005
Location: San Diego, CA
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My Ride: '99 323i
Steering wheel jerking on rapid brake application

Attached is the service instruction from the TIS entitled "Steering wheel jerking on rapid brake application", which BMW calls an "oversensitive front axle."

Short version -
Quote:
A "jerk" can be felt in the steering wheel at all speeds when the brakes are applied rapidly. This is felt in the form of a pulse, i.e. the "jerk/vibration" is only felt at the very start of each rapid brake application.

It is not possible to say which side the steering will pull to first. The brakes work properly. Vehicle yaw is not discernible.
Repair procedure:
1) Check/fix Alignment
2) Bleed brakes
3) Check/replace control arm bushings
Attached Files
File Type: pdf steering wheel jerking.pdf (195.0 KB, 372 views)
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Old 10-22-2007, 10:38 AM   #2
ddombrowski
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jpr,

Thanks for that info. I actually have those symptoms right now, but dealing with them is on the back burner to get done after the rear tires I've been dealing with.

I first noticed this symptom after replacing my CABs the first time. My first set of CABs lasted only 3k miles before they failed again, which made me quite upset.

The second time around, I replaced the CABs and the CAs at the same time. When I was all done, the car drove pretty smooth, but I had the steering wheel jerk.

The last time I replaced my brake pads and rotors, I bled the front calipers only. The brake jerk is mitigated, but not completely gone. I don't notice it with my hands in the wheel anymore (only when I look at the wheel with my hands off of it) and thats good enough for now.

FWIW, I did not get an alignment after replacing the front CABs. I should have, but couldn't find anyone I trusted, and eventually gave up.

So, theres some anecdotal evidence to go with this TSB.
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