Brake Squeal

[foldpages]

Originally Posted by dorian

The way it was explained to me is that it is all new front wear components for all X5M and X6M before a certain build date (sometime past summer '17). I was specifically told it had to include all wear components as my current ones would already be matching due to scoring and such.

When the parts arrived and they were to put them on, they realized I already had this 'redesign'....which is hilarious as my brakes were so loud I wouldn't drive in the downtown core as it was so embarrassing. People would actually yell at me.

So, mine got the chamfer, sand, lube only. That immediately reduced noise by 99%. A week later only 95%, month maybe 80%. Essentially the trend is they get louder by the week.

I just dropped mine off for service this morning and mentioned the PuMA. They said they are aware but it doesn't seem to be a fix. It will only provide temporary relief and that the squeal is to be expected with any BMW Sport or M breaks. It's really sad.

[yewlock]

Originally Posted by foldpages

I just dropped mine off for service this morning and mentioned the PuMA. They said they are aware but it doesn't seem to be a fix. It will only provide temporary relief and that the squeal is to be expected with any BMW Sport or M breaks. It's really sad.

MPBK with solid disk doesn’t squeal.

[Apple Corps]

Originally Posted by yewlock

MPBK with solid disk doesn’t squeal.

yewlock - would you please expand a bit on the MPBK - do you have it installed? What has your experience with it been vis a vis braking performance? Cost?

I am still in break-in mileage and no squeal. If it does become an issue and the MPBK is the solution, I will go that way quickly as opposed to mucking around with short lived quasi-fixes and multiple trips to the dealer.

BTW - what does PuMA stand for?

[Bobby_Drake]

Originally Posted by foldpages

I just dropped mine off for service this morning and mentioned the PuMA. They said they are aware but it doesn't seem to be a fix. It will only provide temporary relief and that the squeal is to be expected with any BMW Sport or M breaks. It's really sad.

Disappointing for over $100K car. My M6 GC did not squeal nearly as much as my X5M. Do we need to have a class action suit vs BMW to have them address this properly???

[yewlock]

Originally Posted by Apple Corps

yewlock - would you please expand a bit on the MPBK - do you have it installed? What has your experience with it been vis a vis braking performance? Cost?

I am still in break-in mileage and no squeal. If it does become an issue and the MPBK is the solution, I will go that way quickly as opposed to mucking around with short lived quasi-fixes and multiple trips to the dealer.

BTW - what does PuMA stand for?

I am in break in process, will report back

[AwesomeM3]

Originally Posted by Apple Corps

BTW - what does PuMA stand for?

Found this online:

PuMA is a worldwide BMW database of all reported problems and most with their appropriate fixes. I think the acronym means Problem and Measures Management Aftersales or in German: Problem und Mebnahmenmanagement Aftersales.

[Apple Corps]

Originally Posted by AwesomeM3

Found this online:

PuMA is a worldwide BMW database of all reported problems and most with their appropriate fixes. I think the acronym means Problem and Measures Management Aftersales or in German: Problem und Mebnahmenmanagement Aftersales.

I'm glad you gave me the English "version" first - Thanks.

[Apple Corps]

Originally Posted by yewlock

I am in break in process, will report back

Understood - but do you have the MPBK installed already? What I am trying to sort out is if there is a totally different BMW front brake package that we can try if the squeal develops.

Those of us with new X5M purchases have just paid out over $100,000 for this high performing vehicle and don't want to diminish our enjoyment over a squeal issue. I won't be happy if I have to pay for a non warranty squeal fix via the MPBK but I am not going to get myself sidetracked if that becomes an issue.

On a side note I am well underway with specs and test drives on our next vehicle addition.

Life is short - need to enjoy the views, smell the roses, drive the roads

[Apple Corps]

I just looked up the BMW MPBK on the BMW site and it is a two piece rotor, not a one piece. It has an aluminum hat riveted on.

Am I looking at the wrong part or missing something?

[Skyracer]

^^ Well that does not sound like the OEM X5M brake system. For starters, the OEM discs are just cross-drilled, there are no grooves.

The hats are on radial pins, not rivets as described in the clip.

Also, to my eye the OEM rear calipers look like sliding units, not fixed units - please feel free to correct me if I'm wrong.

[Apple Corps]

You referenced the MPBK as not squealing as it has a solid disk. When I looked up the MPBK on the BMW website is describes it as a two piece rotor.

The MPBK is not the OEM brake system. It is a BMW upgrade to the stock BMW X5 M brake as I understand it.

I am wondering if you have not distinguished between the stock BMW X5M rotors and the BMW MPBK rotors? Where are you finding the MPBK with a solid disk?

[Maverik259]

Originally Posted by Apple Corps

You referenced the MPBK as not squealing as it has a solid disk. When I looked up the MPBK on the BMW website is describes it as a two piece rotor.

The MPBK is not the OEM brake system. It is a BMW upgrade to the stock BMW X5 M brake as I understand it.

I am wondering if you have not distinguished between the stock BMW X5M rotors and the BMW MPBK rotors? Where are you finding the MPBK with a solid disk?

The MPBK is an upgrade for the F15/16 not F85/86. It's essentially the exact brake system off an E70 X5M which had non drilled rotors with 4 pot fronts.

The rear rotor and caliper is the same on the E70 M, X5 50i, and the F85.

Whatever the PDF is above is not for the X5M. Those rotors are entirely tooooooo small! Lol

Now instead of the MPBK rotor (which would fit the F85) you can upgrade to the M5 rotor. F85 and M5 (F10 I believe) share the same caliper but have different mounting points. Adapters can be made and are solid on eBay from Solid aluminum. Plus the M5 rotors are effing cheaper. But idk if they complain of any squealing or not.

[Maverik259]

Originally Posted by Apple Corps

I just looked up the BMW MPBK on the BMW site and it is a two piece rotor, not a one piece. It has an aluminum hat riveted on.

Am I looking at the wrong part or missing something?

Not for the X5M. No MPBK for the F85.

Look at those rotor sizes. This has got to be for a car or X1/2/3 or something.

F85 rotors are 390/34 and 385/24.

[Apple Corps]

Maverik259

If you look at the heading it is for a 2018 X5 M - that was a screen grab straight from the BMW site. I did not even notice the rotor size as I was focused on the rotor construction.

That may be a site error but it reads as it reads. Skyracer referenced a BMW MPBK with a solid disk - that is what I was trying to sort.

Based on your input there is no BMW MPBK for our F85 and the brake squeal solution vis a vis "newly designed" parts really does not exist?

Good news is my X5 M is so new that a squeal has not reared its head and this may all be academic for late build owners. Bad news is maybe not.

[Kief]

Originally Posted by Apple Corps

Good news is my X5 M is so new that a squeal has not reared its head and this may all be academic for late build owners. Bad news is maybe not.

Don't hold your breath...my 6/21/18 production '18 X5M squeals with 850 miles on it! Perhaps it's climate-related? I see you're in CA, low humidity??, but out here in the Northeast it's been brutal!

[Apple Corps]

Kief - I suspect I will be dealing with it at some point - that is why I have spent some time researching it in advance. If it develops I'd pay for an after market solution out of my own pocket before I would do the multiple trips to the dealer with wasted time and effort.

You are correct - Central Valley of CA is quite dry and hot. Our rain season will be arriving shortly and I won't be shocked if it develops.

Rather surprised that a clear cut solution to the issue has not surfaced.

[Maverik259]

Originally Posted by Apple Corps

Maverik259

If you look at the heading it is for a 2018 X5 M - that was a screen grab straight from the BMW site. I did not even notice the rotor size as I was focused on the rotor construction.

That may be a site error but it reads as it reads. Skyracer referenced a BMW MPBK with a solid disk - that is what I was trying to sort.

Based on your input there is no BMW MPBK for our F85 and the brake squeal solution vis a vis "newly designed" parts really does not exist?

Good news is my X5 M is so new that a squeal has not reared its head and this may all be academic for late build owners. Bad news is maybe not.

Yes that was my point. It was incorrect. Cuz it's not a thing. I never said you were wrong in fact I said to look at the PDF cuz it's wrong.

[Maverik259]

Originally Posted by Apple Corps

Kief - I suspect I will be dealing with it at some point - that is why I have spent some time researching it in advance. If it develops I'd pay for an after market solution out of my own pocket before I would do the multiple trips to the dealer with wasted time and effort.

You are correct - Central Valley of CA is quite dry and hot. Our rain season will be arriving shortly and I won't be shocked if it develops.

Rather surprised that a clear cut solution to the issue has not surfaced.

There are only two other rotor solutions I've found (some group on ebay and racing brake). eBay is dog dirt cheap and racing brake is not but remains a true two piece design in which the irons rings can be replaced for less money but RB isn't cheap). I had RB on my AMG and loved em. Their pads too.

Personally I think simply having a slot option would help with the squeal quite a bit. There is also a seller on eBay who is taking the blanks from the MPBK, cutting in slots And selling at a mark up.

[Apple Corps]

Ouch - RB takes "isn't cheap" to a whole new level

$6,000 - $7,000 would take some serious thought as a solution.

Two questions - have you experienced the really bad squeal issue and, if so, did you install the RB system and find it to really solve the squeal issue?

Thanks...

[Skyracer]

Originally Posted by Maverik259

Personally I think simply having a slot option would help with the squeal quite a bit.

I wouldn't hold your breath. I have slotted discs on my Lotus and they squeal, street or race pad alike. I suspect you will find that squealing is more of a common issue with fixed calipers; I've had very few cars with sliding calipers that had a problem with noise.

That being said, I doubt that the cross drilling helps matters. Not all BMWs with fixed calipers are noisy: my wife's m240xi has them front and rear (no drilling or slotting on the discs) and it is nice and quiet.

[Apple Corps]

The more I try to dig into this the more having a spray bottle of P21S and the garden hose handy once a week is the "solution" - but I hope something better is available.

[Maverik259]

Originally Posted by Apple Corps

Ouch - RB takes "isn't cheap" to a whole new level

$6,000 - $7,000 would take some serious thought as a solution.

Two questions - have you experienced the really bad squeal issue and, if so, did you install the RB system and find it to really solve the squeal issue?

Thanks...

That's for carbon ceramic. They make just rotors for the oem set up for about $1200 for the set including pads.