Heavy Vibrations in Steering Wheel & Pedal When Braking

slaughter.mode · 11-18-2020, 08:40 PM

I can't figure it out. I've had the wheels straightened and are balanced perfectly fine I've even replaced a wobbly hub but the shaking persists (I thought that was for sure the issue). The only thing left is the rotors and pads but they've been fine for ~78K miles, the wear is looking smooth and even, and it would be strange to suddenly be completely this dramatically warped.

Any other suggestions as to what this may be? Thanks.

ClubsportJunkie · 11-18-2020, 09:05 PM

Check the rubber bushings for your front control arms they might be going bad at this point, checks out with the mileage if they haven't been replaced yet.

hC1001 · 11-18-2020, 09:54 PM

Err... these are the hardest to diagnose. I agree try checking the front bushings. On a different car, i had a warped rotor cause the same issues you have. Replacing the rotors fixed my issue. Do the front rotors need replacing? 78k is pretty good lifespan.

slaughter.mode · 11-19-2020, 11:13 AM

Quote:

Originally Posted by Sh4d0w

Check the rubber bushings for your front control arms they might be going bad at this point, checks out with the mileage if they haven't been replaced yet.

I'll check them out, thanks.

Quote:

Originally Posted by hC1001

Err... these are the hardest to diagnose. I agree try checking the front bushings. On a different car, i had a warped rotor cause the same issues you have. Replacing the rotors fixed my issue. Do the front rotors need replacing? 78k is pretty good lifespan.

Just the front? They seem fine but I don't really know how to tell by looking. It's just odd they suddenly became warped over night. Literally the issue just started out of nowhere.

andrei.m4 · 11-21-2020, 11:55 PM

Vibrate all time or just after a few hard braking, if after hard braking brake pads are damaged.

slaughter.mode · 11-23-2020, 07:57 PM

Well, decided since I have 80K on my 2018 M4 it's time to just swap the pads + rotors...now all is well. Guess it was just that. Random that the brakes decided to just go out overnight it seemed. Maybe it's the drastic temperature change, who knows. I don't really slam the brakes, ever.

11-18-2020, 08:40 PM	#1
slaughter.mode Major 881 Rep 1,044 Posts Drives: 2018 M4 Competition Join Date: Mar 2018 Location: Chino Hills, California iTrader: (0) Garage List 2018 BMW M4 ZCP [9.80]	Heavy Vibrations in Steering Wheel & Pedal When Braking I can't figure it out. I've had the wheels straightened and are balanced perfectly fine I've even replaced a wobbly hub but the shaking persists (I thought that was for sure the issue). The only thing left is the rotors and pads but they've been fine for ~78K miles, the wear is looking smooth and even, and it would be strange to suddenly be completely this dramatically warped. Any other suggestions as to what this may be? Thanks.
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11-18-2020, 09:05 PM	#2
ClubsportJunkie Private First Class 312 Rep 190 Posts Drives: M4 GTS Join Date: Feb 2010 Location: Fairfield County iTrader: (0)	Check the rubber bushings for your front control arms they might be going bad at this point, checks out with the mileage if they haven't been replaced yet.
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11-18-2020, 09:54 PM	#3
hC1001 Captain 591 Rep 986 Posts Drives: E36 M3, F80 M3 Join Date: Nov 2019 Location: Brooklyn, NY iTrader: (4)	Err... these are the hardest to diagnose. I agree try checking the front bushings. On a different car, i had a warped rotor cause the same issues you have. Replacing the rotors fixed my issue. Do the front rotors need replacing? 78k is pretty good lifespan.
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11-21-2020, 11:55 PM	#5
andrei.m4 Second Lieutenant 113 Rep 291 Posts Drives: bmw f82 Join Date: Mar 2019 Location: Romania iTrader: (0)	Vibrate all time or just after a few hard braking, if after hard braking brake pads are damaged.
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11-23-2020, 07:57 PM	#6
slaughter.mode Major 881 Rep 1,044 Posts Drives: 2018 M4 Competition Join Date: Mar 2018 Location: Chino Hills, California iTrader: (0) Garage List 2018 BMW M4 ZCP [9.80]	Well, decided since I have 80K on my 2018 M4 it's time to just swap the pads + rotors...now all is well. Guess it was just that. Random that the brakes decided to just go out overnight it seemed. Maybe it's the drastic temperature change, who knows. I don't really slam the brakes, ever.
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