Shaking in brake pedal and steering wheel?!

MAGjersey

Jersey Born ‘nd Raised

Current:
2016 F30 328i xDrive — Glacier Silver Metallic (Ext.) Black w/ Red Highlights (Int.) — Fully Loaded

Retired:
2011 E90 328i xDrive — Titanium Silver (Ext.) Black (Int.) — Fully Loaded :rofl:

CALWATERBOY

Banned

What is connected to both steering wheel and brake system?

MAGjersey

Jersey Born ‘nd Raised

What is connected to both steering wheel and brake system?

Current:
2016 F30 328i xDrive — Glacier Silver Metallic (Ext.) Black w/ Red Highlights (Int.) — Fully Loaded

Retired:
2011 E90 328i xDrive — Titanium Silver (Ext.) Black (Int.) — Fully Loaded :rofl:

thekurgan

Bad Lieutenant

You’ve got some deposits on the rotor(s), it is causing the brakes to pulsate and in turn, shimmy your steering wheel.

Google: «brake judder»

Ilse
2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB

Bruna
2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts / E36M3 FCAB / Beisan VANOS Seals

MAGjersey

Jersey Born ‘nd Raised

You’ve got some deposits on the rotor(s), it is causing the brakes to pulsate and in turn, shimmy your steering wheel.

Google: «brake judder»

Current:
2016 F30 328i xDrive — Glacier Silver Metallic (Ext.) Black w/ Red Highlights (Int.) — Fully Loaded

Retired:
2011 E90 328i xDrive — Titanium Silver (Ext.) Black (Int.) — Fully Loaded :rofl:

lqaddict

Salz und Pfeffer

laser

Registered

«sometimes you’re the windshield . sometimes you’re the bug»
___________________________
2017 330i M- Sport Black Sapphire Metallic
2014 328i Mojave Metallic
2009 328i Black Sapphire Metallic
2007 328i Black Sapphire Metallic
2007 Honda S2000 Berlina Black

hondo402000

Banned

thekurgan

Bad Lieutenant

Doubtful these rotors are warped but rather have a very uneven layer of deposits bonded in areas along the rotor.

The all-important transfer layer
As stated above, the objective of the bed-in process is to deposit an even layer of brake pad material, or
transfer layer, on the rubbing surface of the rotor disc. Note the emphasis on the word even, as uneven pad
deposits on the rotor face are the number one, and almost exclusive cause of brake judder or vibration
.
Let’s say that again, just so there is no misunderstanding. Uneven pad deposits on the rotor face are the
number one, and almost exclusive cause of brake judder or vibration.
It only takes a small amount of thickness variation, or TV, in the transfer layer (we’re only talking a few ten
thousandths of an inch here) to initiate brake vibration. While the impact of an uneven transfer layer is almost
imperceptible at first, as the pad starts riding the high and low spots, more and more TV will be naturally
generated until the vibration is much more evident. With prolonged exposure, the high spots can become hot
spots and can actually change the metallurgy of the rotor in those areas, creating «hard» spots in the rotor
face that are virtually impossible to remove.

Ilse
2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB

Bruna
2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts / E36M3 FCAB / Beisan VANOS Seals

CALWATERBOY

Banned

Did you Google? Try that with no such thing as warped rotors.

Read like your job depended on it. You might see something about bedding shoes; strong braking at speed.

thekurgan

Bad Lieutenant

did you google? Try that with no such thing as warped rotors.

Read like your job depended on it.

Ilse
2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB

Bruna
2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts / E36M3 FCAB / Beisan VANOS Seals

CALWATERBOY

Banned

What is connected to both steering wheel and brake system?

MAGjersey

Jersey Born ‘nd Raised

Did you Google? Try that with no such thing as warped rotors.

Read like your job depended on it. You might see something about bedding shoes; strong braking at speed.

Current:
2016 F30 328i xDrive — Glacier Silver Metallic (Ext.) Black w/ Red Highlights (Int.) — Fully Loaded

Retired:
2011 E90 328i xDrive — Titanium Silver (Ext.) Black (Int.) — Fully Loaded :rofl:

Tom K.

Registered

That’s the usual cause for steering shake upon braking — although it seems to be relatively uncommon on BMWs.

Glad it’s being properly handled under warranty.

laser

Registered

Good deal . warranty / full maintenance is a wonderful thing on these cars.

As an aside, you can also Google «no such thing as a cryptic message board pompous know it all» . but that doesn’t mean there isn’t one .

«sometimes you’re the windshield . sometimes you’re the bug»
___________________________
2017 330i M- Sport Black Sapphire Metallic
2014 328i Mojave Metallic
2009 328i Black Sapphire Metallic
2007 328i Black Sapphire Metallic
2007 Honda S2000 Berlina Black

thekurgan

Bad Lieutenant

Ilse
2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB

Bruna
2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts / E36M3 FCAB / Beisan VANOS Seals

bear-avhistory

2020 Z4 M40i

CALWATERBOY

Banned

Yeah that’s pretty much it.

Sometimes brakes are smooth cold; develop judder as they warm. Retorque wheel bolts, prescribed sequence.

Can be suspension problems.

Warped [permanently] rotors? Very unlikely, but a convenient catch-all customers readily accept.

CALWATERBOY

Banned

Good deal . warranty / full maintenance is a wonderful thing on these cars.

As an aside, you can also Google «no such thing as a cryptic message board pompous know it all» . but that doesn’t mean there isn’t one .

no such thing as warped rotors. did you try Googling that?

DSXMachina

Bimmerdex 7.4!

Oh man do I ever want to stay the heck out of this. But I can’t. Never had much sense.
I’ve read all the articles on rotor deposits causing ‘judder’ or what we in the trade more commonly call brake (pedal) pulsation. It is usually accompanied by rapid but relatively small steering wheel movement in time with the pulsation. Sorry, but my 36 years of experience is that the overwhelming cause is warped rotors which is easily determined with the use of a dial indicator. Pulsation can be perceived beginning at about .002″ tir (total indicator reading) and is really objectionable by about .005″. The variation can be either out of parrallellism, a sunken spot (it happens!) or warpage. Warpage being the most common cause, and improper tightening of lug bolts being the most common cause of the warpage.

We’re starting to see a lot of rotors warped out of the box, especially the lower priced white boxers. Some rotors are improperly stress relieved at the factory and warp after going through a few good hot cycles on the car.

Have I seen deposits cause judder? Absolutely, but I can’t remember the last time. In my opinion it’s a thing of the past. We used to see ‘hard spots’ on rotors which are very shiny areas which were raised up over the general surface by a mil or two. They also caused vibration. Whether it’s due to new rotor alloys or pad materials I can’t say, but hard spots have been gone for decades.

There is no doubt that warpage has caused the greatest incidence of pulsation in my experience, over 99% by far. We remove the rotors, clamp them into a brake lathe (Hoffman, made in Germany) and set a dial indicator on the inner and outer wear surfaces. You can see the dial needles move in tandem in and out. That’s warpage. We machine them to factory specs and the pulsation is gone.

Now, bomb me with links to sites that say I’m wrong. I can only speak from experience.

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