vibration when braking?

2009 BMW 335
104,000 MILES • 6 CYL • TURBO • 2WD • AUTOMATIC
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BHAMDOC1973
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There is vibration when you hit the brake, but it's not so much in the steering, there is some, but it's in the front wheels. jacked it up and looks like the front rotors and brakes are new, slotted drilled rotors, tires are new, wheels in great, only thing I found was low air pressure in all tires...have not yet driven it since inflated. rear brakes also look new. Checked for any play on front and there is none on 12-6 or 3-9.
May 1, 2023 at 3:13 PM
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BORIS K
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Hello,

Steering wheel and chassis vibrations could be caused by various factors.

Tires Are Out of Balance:
When your tires are out of balance, you will likely experience vibrations when you are driving between about 50 to 60 MPH, but they will smooth out as you drive faster. This problem can happen if the tires are in bad shape from wear or if they have developed flat spots from lack of use. Re-balancing or replacing your tires may improve or eliminate the problem.

A less common, though still possible reason for the vibrations, is that the air pressure in your tires is low, which can easily be remedied by inflating the tires to the proper pressure.

Brakes Are Warped:

If you experience steering wheel vibration when you brake while driving at higher speeds, then it's possible that your brake rotors are warped. Warping happens for a variety of reasons, including running through cold water with overheated brakes and over-torquing the lug nuts.

The problem can also be caused by a stuck caliper and excessive brake pad residue. It only takes a small amount of warping to make the steering wheel noticeably vibrate while braking. Most of the time, turning or replacing the rotor as well as replacing the stuck caliper will solve the problem.

Inspect the lower control arm bushings for possible wear/excessive movement

A good video, not your specific model but still applicable:
https://youtu.be/ibZcI9oXOtU

A document:
https://www.2carpros.com/articles/how-to-fix-a-car-with-shaky-steering-wheel-when-braking

Cheers, Boris
May 2, 2023 at 7:41 AM
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BHAMDOC1973
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Thanks.
May 2, 2023 at 7:57 AM
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BHAMDOC1973
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Inflated the tires and went for a drive, no shaking while driving even up to 80 except when you brake so tires and wheels are most likely out. Only after you brake, even when the rotors are cold. If the control bushings are bad i would have known, had so many of these but it doesn't have it and does not pull and especially when you brake it does not pull or cause a clunk that is associated with a bad bushing. Here are pictures of the rotors. Do you know if these can be turned? And if yes can i use the sane pads just to see first whether the rotors were the issue? I can then replace the pads.
May 2, 2023 at 10:14 AM
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BHAMDOC1973
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Removed them and these pads are bad CarQuest brand, i doubt they changed rotors maybe just pads to get by. And the marks do not look good. And going to turn the rotors and get some good pads and see. And where the rotors sit may not have been cleaned.
May 2, 2023 at 3:57 PM
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BORIS K
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Hello,

Thanks for the feedback.
The rotors and brake pads certainly do not look great.
Let us know if you require any further assistance with this vehicle.

Cheers, Boris
May 3, 2023 at 3:30 AM