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Suspension & Braking Forum by BimmerWorld
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Old 06-18-2015, 09:42 AM   #1
roys
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Arrow shaking steering wheel and pedal on braking

hello guys,
my E46's steering wheel shakes on braking, i have replaced my rotors and the brake pads 4 months ago and ran about 5000 KM. The mechanic told me that there's no problem with my suspension system (but i doubt). has someone faced similar problem, and what might be the solution.

Last edited by roys; 06-18-2015 at 09:48 AM.
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Old 06-18-2015, 09:48 AM   #2
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Front control arm bushings.
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Old 06-18-2015, 09:55 AM   #3
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You may need new front rotors and pads.
Rotors can warp over time if they have worn down and are too thin.

I had this problem a few months ago. New rotors and pads, no more shaking.

It could also be old and worn out FCAB's and ball joints.
Jack up the car and see if you can shake the front wheels.
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Old 06-18-2015, 09:59 AM   #4
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Thanks guys, but i already replaced it. The fiest 3000 km the car drives great and brakes great too but the shaking restarted one month ago. Ill try to replace the bushings.
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Old 06-18-2015, 10:51 AM   #5
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Quote:
Originally Posted by roys View Post
Thanks guys, but i already replaced it. The fiest 3000 km the car drives great and brakes great too but the shaking restarted one month ago. Ill try to replace the bushings.
Diagnose the issue before throwing parts at it.

Your calipers could be stuck and cause differential braking from one side of the rotor to the other. Your caliper carrier could be loose. You could have bad CABs, CA, or tie rods.

Inspect and diagnose...you'll get frustrated, I think, if you just start throwing parts at it. Although, all that said, CABs would be the odds on most likely scenario.
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Old 06-18-2015, 11:24 AM   #6
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FCAB only last about 40k miles IMHO, but these typically will not cause brake pedal pulsation, just steering wheel shaking.

As mentioned, check for hanging calipers, hanging caliper hardware/bushing and check rotors for uneven pad deposits/runout.

Might be best to skim the rotors to make flat and parallel again and verify calipers and hardware/bushings are good.
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Old 06-18-2015, 11:33 AM   #7
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Originally Posted by roys View Post
... i have replaced my rotors and the brake pads 4 months ago
Quote:
Originally Posted by BB BMW View Post
You may need new front rotors and pads.
Rotors can warp over time if they have worn down and are too thin.
Read more than the subject line before offering advice. I'll just add that brake discs don't actually "warp", the thickness variation seen in "warping" is due to uneven pad material transfer on the disc surface.

This Stoptech article outlines what I'm talking about, but there are lots of others out there.
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Old 06-18-2015, 01:14 PM   #8
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Read more than the subject line before offering advice. I'll just add that brake discs don't actually "warp", the thickness variation seen in "warping" is due to uneven pad material transfer on the disc surface.

This Stoptech article outlines what I'm talking about, but there are lots of others out there.
https://search.yahoo.com/yhs/search;...&hsimp=yhs-004



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Old 06-18-2015, 03:43 PM   #9
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I would actually bet on sticking brake caliper. Unless the mechanic is incompetent, blown FCABs are easy to see. Do any of your wheels have significant amounts of brake dust on them?
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Old 06-18-2015, 04:00 PM   #10
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Originally Posted by MacFady View Post
Read more than the subject line before offering advice. I'll just add that brake discs don't actually "warp", the thickness variation seen in "warping" is due to uneven pad material transfer on the disc surface.

This Stoptech article outlines what I'm talking about, but there are lots of others out there.
Mac is right - it's an uneven transfer of the brake material that causes the pulsation. One of the reasons you clean the rotos with brake cleaner then actually "break" them in by doing some long braking after installing new pads and rotors - you are transferring pad material evenly to the rotor.

OP - You could always clean the rotors with brake cleaner and try to break the pads/rotors in again.

Edit: That's after you diagnose calipers etc as suggested by Dmax & Jfoj.

Lastly - Can't tell if you have an XI - a badly worn front axle can cause this on the AWD models too.
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Old 06-18-2015, 04:06 PM   #11
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Old 06-18-2015, 04:16 PM   #12
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Replace your front control are bushings AND your steering guibo!


This will correct most front end problems and looseness.


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Old 06-18-2015, 07:21 PM   #13
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Replace the front control arm bushings. I thought the shaking was brakes on mine until replacing the bushings fixed it. Easy $50 fix.
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Old 06-18-2015, 07:40 PM   #14
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DMAX is right. Take a look at things first and try to diagnose the problem before spending money. Ready, fire, aim is not a good plan.
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Old 06-19-2015, 01:02 AM   #15
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i don't think that there's any leak on the calipers, my mechanic checked the CABs but said that it's tight enough. But ill ask some other mechanic about my problem.

Last edited by roys; 06-19-2015 at 01:06 AM.
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Old 06-19-2015, 09:16 AM   #16
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I just had this issue, turns out one of the wheel weights on one of my front wheels fell off.
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Old 06-19-2015, 10:17 AM   #17
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how old and what mileage is your car?

I am at 208K now and just went through 3 sets of rotors before narrowing this down to being bad calipers. It was not overly noticeable from depressing the caliper piston, or driving, but over time it ate through my rotors and cause pad deposits and hot sports that made them feel warped. After all I went through, and considering the cheap cost of new calipers compared to endless sets of rotors, if you are at any decent high mileage, save yourself some headaches (after a wheel rotation of course to rule out what happened to Jake above), and replace both calipers. I literally had steering wheel and brake shimmy for about 3 F'n years man. Do the calipers now, trust me.
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Old 06-19-2015, 10:26 AM   #18
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Quote:
Originally Posted by MacFady View Post
Read more than the subject line before offering advice. I'll just add that brake discs don't actually "warp", the thickness variation seen in "warping" is due to uneven pad material transfer on the disc surface.

This Stoptech article outlines what I'm talking about, but there are lots of others out there.
THIS GUY knows what he is talking about. I feel like I would have written the EXACT same post myself!

Quote:
Originally Posted by BB BMW View Post
THIS GUY has zero idea what he is talking about, but for shits and giggles, click his link, see Stoptech article posted above, is the second item down!

Quote:
Originally Posted by BMWCaptain View Post
Replace your front control are bushings AND your steering guibo!


This will correct most front end problems and looseness.


.
THIS GUY has zero idea what he is talking about. If you feel a pulsation in the brake pedal, pay no attention to this comment whatsoever.

Quote:
Originally Posted by jmecmore View Post
Replace the front control arm bushings. I thought the shaking was brakes on mine until replacing the bushings fixed it. Easy $50 fix.
THIS GUY does not know how to properly diagnose a shimmy issue up front. When the FCAB's are going bad, and you stab at the brake pedal, you will probably see your steering wheel move quickly right or left, but there will be no shimmy when landing on the brakes hard.

Take everything with a grain of salt with this job, and just think carefully about the situation and do tests so that you can start eliminating things. Do not just take advice and roll.
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Old 06-19-2015, 11:02 AM   #19
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well if its the rotors 30$ at oreilly they will resurface ur brake rotors. just got mine done because even though theres less than 10k on them i had uneven pad transfer
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Old 06-22-2015, 06:21 AM   #20
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The suspension expert told me that he will align my old rotors and replace it also replace my steering rack. CAB and control arms are like new and tight enough. calipers work great. ill find out the next week.
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