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-   -   Braking solution? (http://forum.e46fanatics.com/showthread.php?t=942900)

PrecisionX 09-05-2012 01:03 PM

Braking solution?
 
I'm starting to get a little steering wheel vibrations in certain braking situations with my 02 330Ci with 56k ish. Any recommendations? Just pads and rotors or more stuff?

bratliff 09-05-2012 01:10 PM

Have you checked your suspension components? Jack the car up, inspect brakes and and bushings. Worn bushings can cause this as well. No real way to tell what you need without a visual inspection. If you aren't sure, take pics and post 'em.

Zell 09-05-2012 01:12 PM

Check bushings, new pads + turn rotors (or new rotors if they're at min). Basically the best ways to fix steering wheel vibration on braking.

PrecisionX 09-05-2012 01:16 PM

Ive run my fingers down my cold rotors and it's not smooth. It's bumpy.

Zell 09-05-2012 01:23 PM

Use a micrometer and check the minimum thickness. If it's above that, go get them turned. If not, go get new ones. Those bumpy spots are hot spots from the pad on the rotor.

Should only cost you about $15-25 per rotor. Much cheaper than buying new ones, unless you go with Meyles. They're about $26 per rotor last I checked at https://www.europartsdirect.com/

I wanted to get mine checked cheap on the fly and took it to Firestone, because I figured it'd be very difficult for them to screw up something as simple as brakes. They even said they wanted to put my car on a special lift (on which I saw another E46 getting brake work done). The shop mechanic took a look at everything, sat down on the couch next to me and told me my rotors would be too thin if he turned them, and recommended that I DIY the brake job myself since it would cost a lot. Good guy. Only cost me $20 to have them look at it all. If they know you love your car, mechanics will take care of you. Well...most of them, I've seen in my experience.

If you do take it to Firestone or somewhere cheap to get them turned, I would do one of the following:

1. Take the rotors off and just bring them to the mechanic to turn. I'm sure they wouldn't mind and would probably give you a small discount for lack of labor. If you do this, just take it to the cheapest place that can turn rotors. It's a very easy thing to do.

2. After you get your car back, undo the lug nuts and re-torque them to specs with your own torque wrench. Chances are they put them back on with an impact wrench and are too tight.

GSherbs 09-05-2012 02:07 PM

is the vibration always there regardless of speed? if so, suspect rotors

or does it seem to only occur at higher speeds and then become more or less unnoticable as your speed decreases? if so, suspect front control arm bushings.

I had the latter at about 58k miles.

Gambitpaul 09-05-2012 02:24 PM

I had something similar in my 06 330Ci 95k miles. Very, very minor shudder under light braking. My front brakes were below min thickness, so I did that DIY. Felt better after that.
Plus it was time for new tires. They were almost slicks due to some track days I did this summer. And you could see significant feathering of the tread on the outside left tires. I also did an alignment because it was pulling noticeably to the right. Although that could be mostly due to the very uneven tire wear. Now I have no shudder.

Try stepping through a few items, checking them off as you go before spending any money:
- pad thickness
- feel the rotors ( should be pretty smooth)
- tire condition
- check the torque on lugs and brake parts
- look for loose or worn suspension components and bushings.

Good luck

Sent from my Evo using Bimmer App

Stinger9 09-05-2012 02:37 PM

Quote:

Originally Posted by PrecisionX (Post 14706810)
Ive run my fingers down my cold rotors and it's not smooth. It's bumpy.

This alone described by an inexperienced member does not tell us anything.
Rotors can be bumpy and still give tens of thousands of miles of service.
I have 96K miles on my original rotors and they will go much further even with the bumps I feel.

tock172 09-05-2012 03:13 PM

Given your mileage, I'd be willing to bet its your FCABs.

jasonbimmer 09-05-2012 03:23 PM

Quote:

Originally Posted by PrecisionX (Post 14706810)
Ive run my fingers down my cold rotors and it's not smooth. It's bumpy.

bumpy as in running finger from center to edge or bumpy running in circles.
theres hot spots/lines and theres normal brake wear.

PrecisionX 09-05-2012 03:26 PM

I was under the car for an oil change and didn't notice any bad bushings. The
Vibration is at any speed, if I slightly touch the brake pedal at low the wheel will shake, higher speeds if I hit the brakes harder at first and slowly apply more pressure it seems to iron out a little bit but I don't think there's 100 percent smooth braking at any time really

PrecisionX 09-05-2012 03:27 PM

Quote:

Originally Posted by jasonbimmer (Post 14707159)
bumpy as in running finger from center to edge or bumpy running in circles.
theres hot spots/lines and theres normal brake wear.

Center to edge, not in a circle

jasonbimmer 09-05-2012 03:27 PM

Quote:

Originally Posted by PrecisionX (Post 14707170)
I was under the car for an oil change and didn't notice any bad bushings. The
Vibration is at any speed, if I slightly touch the brake pedal at low the wheel will shake, higher speeds if I hit the brakes harder at first and slowly apply more pressure it seems to iron out a little bit but I don't think there's 100 percent smooth braking at any time really

take a pic of how the rotors look like.

Locutus09 09-05-2012 03:27 PM

Re-bed the pads. Do 5 60-0 stops and park the car w/out the e-brake or any brakes engaged and let them cool.

I think you've built up deposit on the rotors and you just need to brake them off.

Warped rotors are highly un likely

Sent from my DROID X2 using Bimmer App

Stinger9 09-05-2012 03:53 PM

Quote:

Originally Posted by Locutus09 (Post 14707173)

I think you've built up deposit on the rotors and you just need to brake them off.

Warped rotors are highly un likely

+1
Become a genius on your block.
Read this: http://www.stoptech.com/technical-su...l-white-papers

SINEREOTYPE 09-05-2012 03:55 PM

Quote:

Originally Posted by Gambitpaul (Post 14706995)
I had something similar in my 06 330Ci 95k miles. Very, very minor shudder under light braking.

Sent from my Evo using Bimmer App

I have this same slight shuddering during light braking in my rear right wheel now, especially while i am in reverse. This happens intermittently though, so not all the time. It kinda feels like maybe the caliper is loose and buckling a little when i apply the brakes. The pads are good, i tried to move the wheel around a little to see if it was the control arm bushing but there was no movement, i inspected the brakes for any looseness. I'm going to take it to the shop tomorrow for a much more thorough investigation... thanks for the help!

dknightd 09-05-2012 04:42 PM

Quote:

Originally Posted by PrecisionX (Post 14706775)
I'm starting to get a little steering wheel vibrations in certain braking situations with my 02 330Ci with 56k ish. Any recommendations? Just pads and rotors or more stuff?

It is impossible to tell without careful inspection. It could be simple uneven buildup of pad material on your rotors, it could be loose suspension bits, it could be both. Or it could be something else.

A little history might be useful. How long have you had the car? Did your use change recently (for example, did you take up weekend track days)?
Are you running stock rotors and pads? If not, what do you have? Or do you know?

One thing you might try is to make several hard braking sessions.
In a safe place, go from about 60 (edit, or 80 if it safe and legal) mph to about 5 mph. While you do
this pay attention to the vibration. Normally if the problem is brake related the vibration frequency will slow down as you slow down - if the problem is suspension related the frequency will normally not change much with speed. Do this 60->5 thing a few times. Normally, if it is brake related, each stop will get smoother as you redistribute pad material on the rotor (unless your existing rotor is very worn - measuring it and comparing to specs is a good idea). Note I said 60->5, do not bring the car to a complete stop. Depending on your pads and rotors it might take only one hard stop to deposit pad material on your rotor. Once you have that one high spot it keeps getting worse. Sometimes you can clean it off with hard braking, sometimes you can clean it off with brakeclean and steel wool, sometimes you just have to replace (or resurface) the rotor.

The safe bet is to replace everything. That should give you smooth braking for at least a while.

I'm new to BMW, so this advice is based on general experience, which may or may not apply to your car. The advice I give here is worth exactly what you pay for it.

PrecisionX 09-06-2012 02:37 PM

Did the 5x 60-0mph thing and it seemed to help a bit with the lower speed around town braking but highway braking is still giving me a wobbly steering wheel. Here are pics:


http://i651.photobucket.com/albums/u...056326B685.jpg

http://i651.photobucket.com/albums/u...056DCDA71B.jpg

http://i651.photobucket.com/albums/u...0573D8A2A7.jpg

http://i651.photobucket.com/albums/u...0579FA9551.jpg

Zell 09-06-2012 02:48 PM

Those look like some unhappy brake rotors. I'd say they're about ready to be replaced with new pads.

Mango 09-06-2012 02:56 PM

Quote:

Originally Posted by Zell (Post 14706796)
Check bushings, new pads + turn rotors (or new rotors if they're at min). Basically the best ways to fix steering wheel vibration on braking.

did you ever resolve your steering vibrations??


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