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  #1  
Old 11-03-2019, 04:02 PM
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Low Speed Braking Issue: Feature or Problem?

Happy Day Light Savings Time, friends.


Ever since I have had my 2006 4.8is, there is this 'thing' that the brakes do at low speeds which drives me up an f'ing wall. No other car (or other BMW's I have owned) do this.


During low speed braking, say under 25 mph, the pedal feel pulsates. This pulsating is extremely uniform. Also, this only happens during partial braking as in partial depression of the brake pedal. Like a throbbing feel; weak, firm, weak, firm, weak, firm several times a second.


Since owning, I have done an entire brake overhaul: rotors, pads, brake fluid flush, INPA ABS pump activation...there are zero bubbles in the brake lines; all of this did not change the pulsation. I vaguely remember coming across a thread where e53's have this brake assist feature to compensate for trailer weight or the e53 being pig'ish that loosely describes what my 4.8is is experiencing along with a place in INPA or BMW Scanner to disable it. Unfortunately I cannot find the thread. Please enlighten me if the ABS pump may be showing signs of wearing out or if true, a way to disable this stupid feature (if it is in fact one). Mahalo!
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Old 11-05-2019, 11:27 AM
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I have never heard of or experienced this uniform vibration in the brake pedal.
Sorry. You sure it's not worn bushings in the steering/suspension department?

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Old 11-05-2019, 12:21 PM
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I get that on mine, but only when the ABS is cycling and I've really stomped on the binders.

Not sure if a future failing booster can trigger the ABS because of a vacuum problem or an adjustment issue in pedal travel.

Sorry but that's just my WAG....

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Old 11-05-2019, 01:38 PM
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I put new pads/rotors on mine and didn't have time to do a proper pad bedding-in. Mine do the same thing. I don't know if there's anything short of having the rotors lightly turned and properly bedding-in the pads that would help. I'll probably just live with it.

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Old 11-05-2019, 09:37 PM
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I had similar thing with mine, turned out to be lower control arms though.
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Old 11-05-2019, 11:29 PM
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I forgot to add that the entire front suspension was rebuilt in late August. Every suspension arm, ball joint, bushing and tie rod was replaced with the alignment done shortly after. I suppose I'll either bleed the brakes again or perform a bit more analysis on the ABS unit and look for issues. Either way, this pulsating is annoying.
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