Vibration While Braking

**Kat_Somm_Faen** · 04-04-2008 11:46 AM

Hey all,

Any ides what is going on? I got an 04 that gets this slight vibration in the steering when I am on the highway. Kinda annoying... braking seems fine and it performs OK but the steering wheel vibrates.

Anybody had something similar?

THX!

**koolade9** · 04-04-2008 12:29 PM

Could be a few things if it's consistant, braking or not... bent wheel(s), tire(s) out of alignment, wheel bearing(s) going out.

if it's only braking, then you'll need to either have your rotors turned, or buy new ones... read here if you wish to learn more about why your brakes pulsate... Knowledge

**junkie1.8TQ** · 04-04-2008 12:54 PM

Originally Posted by koolade9

Could be a few things if it's consistant, braking or not... bent wheel(s), tire(s) out of alignment, wheel bearing(s) going out.

if it's only braking, then you'll need to either have your rotors turned, or buy new ones... read here if you wish to learn more about why your brakes pulsate... Knowledge

X2 most likely warped rotors.

**drmeegge** · 04-04-2008 03:20 PM

X3 warped rotors.

**michgo** · 04-04-2008 04:53 PM

x4 warped rotors.

the stock a4 ones can quickly be warped after a single hour of hard driving.

**A4Shizl** · 04-04-2008 04:56 PM

they beat me to it ..

x5 on the warped rotors...

**A4TL** · 04-04-2008 05:16 PM

turn the rotors and use a torque wrench on the lugs always.

**mishu28** · 04-05-2008 09:43 AM

Brake disks

**EBG 18T** · 04-05-2008 09:48 AM

Here's another scenerio. Your rotors may be fine, but you may have un-even pad material transfer. I am dealing with this issue right now as i just bedded a new set of Ferrodo DS2500 pads and those pads were not compatible with the prior pad material (carbotech Bobcats) on the rotors. it feels liked a warped rotor sensation, but it is actually uneven pad transfer.

Quote from Stoptech:
"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. "

Stoptech White Page Article on Pad Bedding