[messyhead86]

Hi

I've got an e91 m sport 2007. I've had it 18 months and done 40k miles in it. Since I have had it there has been wheel and brake pedal wobble under braking which gets worse the longer the distance having been driven.

I've changed the pads and discs, recently changed both sets of front control arms and it hasn't made any difference.

I've suggested to the independent garage I normally go to that it may be a gearbox or brake system error and they keep pointing me back to warped discs or pads.

Any help would be greatly appreciated.

[jt335i]

When you last replaced the pads and discs, did you flush/bleed brake system and put new brake fluid?
Just a thought.

[fazman]

Originally Posted by messyhead86

Hi

I've got an e91 m sport 2007. I've had it 18 months and done 40k miles in it. Since I have had it there has been wheel and brake pedal wobble under braking which gets worse the longer the distance having been driven.

I've changed the pads and discs, recently changed both sets of front control arms and it hasn't made any difference.

I've suggested to the independent garage I normally go to that it may be a gearbox or brake system error and they keep pointing me back to warped discs or pads.

Any help would be greatly appreciated.

So when braking, you feel a shudder? Sounds like a warped rotor to me?

[ibd12nv]

Get the front tires balanced. If that does not do it yours rotors should be next.

[messyhead86]

Originally Posted by ibd12nv

Get the front tires balanced. If that does not do it yours rotors should be next.

It had new tyres to get through the MOT last week so its not a balancing issue unfortunately.

[messyhead86]

Originally Posted by jt335i

When you last replaced the pads and discs, did you flush/bleed brake system and put new brake fluid?
Just a thought.

That isn't something that I have had done since owning it and I'm not sure I've seen an invoice anywhere for flushing so this may be the next step.

When the car was MOT'd last week, they brake tested it and there's uneven braking forces to the front wheels but I'm not sure what could be causing this.

[mjn77]

Removed calipers / pins and given them a good clean?

Maybe rebuild them with new seals.

[mweisdorfer]

Originally Posted by messyhead86

Hi

I've got an e91 m sport 2007. I've had it 18 months and done 40k miles in it. Since I have had it there has been wheel and brake pedal wobble under braking which gets worse the longer the distance having been driven.

I've changed the pads and discs, recently changed both sets of front control arms and it hasn't made any difference.

I've suggested to the independent garage I normally go to that it may be a gearbox or brake system error and they keep pointing me back to warped discs or pads.

Any help would be greatly appreciated.

Front bearings perhaps, although I would think you'd hear them.

[messyhead86]

Originally Posted by mweisdorfer

Front bearings perhaps, although I would think you'd hear them.

I don't think its the wheel bearing as I had one replaced last year and the problem was still present after. Also, there's no grinding or noise difference when cornering which there is when a bearing is going.

I wonder whether it could be ABS system related or to do with the master cylinder. It's not the DTC or DSC as when they are both fully off the problem is still there. On short distances sometimes it won't be present and then as soon as more than 5 miles is covered it vibrates the wheel and pulsates the brake pedal which gets quite violent after a motorway run and shakes the whole car.

[messyhead86]

Originally Posted by mjn77

Removed calipers / pins and given them a good clean?

Maybe rebuild them with new seals.

It had one caliper last year as it was leaking. The calipers are quite clean and all else looks ok. The problem was there before and still after, unless its the other caliper that's knackered that's causing uneven braking forces to be applied to each side and then a side to side action.

[Welcome to NBA Jam]

How are your front wheel bearings?

[mweisdorfer]

Originally Posted by messyhead86

I don't think its the wheel bearing as I had one replaced last year and the problem was still present after. Also, there's no grinding or noise difference when cornering which there is when a bearing is going.

I wonder whether it could be ABS system related or to do with the master cylinder. It's not the DTC or DSC as when they are both fully off the problem is still there. On short distances sometimes it won't be present and then as soon as more than 5 miles is covered it vibrates the wheel and pulsates the brake pedal which gets quite violent after a motorway run and shakes the whole car.

If you have the Foxwell scanner, you could activate the ABS system a few times and try and get rid of any air bubbles in the system. Faulty pads ? bad caliper ?

Did you check the caliper pins? Are they sticking or does the caliper slide on the pins as they are supposed to do when braking.....

[a9sublime]

If I remember correctly I had an issue like this with an older car of mine. Something was installed backwards or upside down with the brakes/rotor/caliper/something but I don't exactly recall which part.. that was a long time ago and I've partied way too hard since then. But sounds like everyone's thinking similarly here so that sounds the way to go!

[N54B30A]

Check the bolts for both the upper and lower control arms on the front. I was having the same issue and replaced pads, rotors, and inspected everything brake related but it was just a loose control arm bolt.

[Big Mexican Women]

Originally Posted by messyhead86

Hi

I've got an e91 m sport 2007. I've had it 18 months and done 40k miles in it. Since I have had it there has been wheel and brake pedal wobble under braking which gets worse the longer the distance having been driven.

I've changed the pads and discs, recently changed both sets of front control arms and it hasn't made any difference.

I've suggested to the independent garage I normally go to that it may be a gearbox or brake system error and they keep pointing me back to warped discs or pads.

Any help would be greatly appreciated.

my guess is either or both of the front rims are bent if you've changed the front brakes and the issue is still there, there's no other culprits by this point.

Originally Posted by jt335i

When you last replaced the pads and discs, did you flush/bleed brake system and put new brake fluid?
Just a thought.

if you show us a way to change brakes without needing to flush your brake fluid, I will personally congratulate you. what does a brake fluid flush have to do with wobble under braking anyways?

[chatch10]

I know you said you replaced the control arms, but did you also replace the bushings. I replaced my CA, but not the bushing and it continued until I replaced the thrust bushings.

[Pladi]

^^^ we have a winner.. i agree with the above post as well.

[messyhead86]

I spoke to an independent garage who I've had some work with in the past and he suggested, as others had in this thread, to change the discs. I changed them and was very careful to clean up the hubs and pins, grease everything that needed greasing and the issue disappeared. I've since done 10k miles in the car and it's started to come back.

I spoke with the independent again and he said he's had a few come in with similar issues. The way he's got around it was to use OEM discs. I used Brembo the first time I changed them and then Pagids with the Pagids surprisingly lasting a lot longer before the issue came back.

[Pladi]

Originally Posted by messyhead86

I spoke to an independent garage who I've had some work with in the past and he suggested, as others had in this thread, to change the discs. I changed them and was very careful to clean up the hubs and pins, grease everything that needed greasing and the issue disappeared. I've since done 10k miles in the car and it's started to come back.

I spoke with the independent again and he said he's had a few come in with similar issues. The way he's got around it was to use OEM discs. I used Brembo the first time I changed them and then Pagids with the Pagids surprisingly lasting a lot longer before the issue came back.

Your issue is control arm bushings. Front or back. There are two lower control arms. I am pretty positive it has nothing to do with your brakes.

What i mean by front or back is there are two monted at the fron. One seats more front another more rear.

[david in germany]

Originally Posted by messyhead86

I spoke to an independent garage who I've had some work with in the past and he suggested, as others had in this thread, to change the discs. I changed them and was very careful to clean up the hubs and pins, grease everything that needed greasing and the issue disappeared. I've since done 10k miles in the car and it's started to come back.

I spoke with the independent again and he said he's had a few come in with similar issues. The way he's got around it was to use OEM discs. I used Brembo the first time I changed them and then Pagids with the Pagids surprisingly lasting a lot longer before the issue came back.

Exactly, oem pads and disks, nothing better for the daily driven BMW. Others will have/leave pad deposits causing shakes and shutters under braking.

[david in germany]

Originally Posted by fazman

So when braking, you feel a shudder? Sounds like a warped rotor to me?

Please do a bit of research on this before using the term again, modern rotors don't warp.. Gone are the days of non vented single disks.. We now have issues with pad deposits and hot spots caused by overheating the rotor surfaces. Mechanics will use the term warped rotors because it is an easy sell as well, and the fact that most of them will not turn (resurface) rotors anymore. It just does not make profit and takes too much time over swapping on a new rotor.

[Donethat]

Not sure if an alignment has been suggested. But with this type of problem, it wouldn’t hurt.