07 GSA Rear Spoked wheel problems

[Markgsxr]

I've put a couple of vids on Youtube showing the disc run out and caliper movement. Unfortunately they arent great quality as old camera. It looks worse in the real world than comes across on vids.


http://www.youtube.com/watch?v=rMqYz9JoN64&feature=user

http://www.youtube.com/watch?v=r8COJxTZUPw&feature=user


For the technical minded among you I have a question. A third of the rotation of the disc pushes on the pad which in turn pushes the caliper across giving same effect as a warped disc. Does this mean heat will build up in the pad the disc presses against and in turn the disc? On a long journey could this then in turn heat up the brake fluid?

 

[Magwych]

I had a disk replaced in the 36,000 mile service because it had worn below "manufacturer's tolerance", at 36k miles the original replacement was not FOC, so is itself covered by BMUUs parts warranty. I know that the old disk ran true, so checked the new disk after seeing this thread.

Lo and behold, it is out of true ! The caliper can be clearly seen being moved from side to side on its pins. I measured the axial run-out, which was 0.5mm, much less than it looks, but in excess of the "manufacturer's tolerance" of 0.15mm.

In my case it was clearly the disk at fault, and it was replaced by the dealership without question.

I would suggest actually measuring the run-out an chcecking it against the allowable run-out figure. If the disk is realtively new then there may be a case for requesting replacement under warranty. Whilst the opinions of mates and peers is very valuable, you cannot beat hard and fast factual measurements. The BMUU RepRom DVD contains the allowable run-out figure.

 

[GrinningGSer]

Thanks guys... I am not feeling alone now

My dealer has told me that my disk run out is 0.3mm and I can hardly believe that because mine looks much worse than MARKGSXR's youtube vid

Dealer has told me that 0.3mm is more than he would like at the disk, so he placed a new disk and the situation then became worse!

Next stage is a new carrier and if that fails a new final drive must surely be the only remaining option.

 

[Captain GSA]

Thanks guys... I am not feeling alone now

My dealer has told me that my disk run out is 0.3mm and I can hardly believe that because mine liiks much worse than MARKGSXR's youtube vid

Dealer has told me that 0.3mm is more than he would like at the disk, so he placed a new disk and the situation then became worse!

Next stage is a new carrier and if that fails a new final drive must surely be the only remaining option.

I said I wasn't going to do this but ffs I'm going out there tomorrow if it stops snowing and take a look at mine-this is what happens when you read posts on forums relating to problems.... the paranoia sets in...... I wonder if this is how BMWTekky started life...

 

[GrinningGSer]

I wonder if this is how BMWTekky started life...

AArgh I hope not

 

[csd4t]

Oh sh*t, just checked mine (Sept 07 GSA) disc is running out 1-2mm and wheel 3-4mm, I'm straight on the blower tommorrow to get it sorted. I have dial gauges at home so am going to check more accurately. I believe its the carrier because of the increase in runout in relation to the increase in diameter.

 

[Panzer]

Rear wheels

Firstly there is a problem with the rear rims, hub casting and the mounting surface for the rear disc on the final drive. None of them should be this bad what happened to their quality control do bmw make these items in house? i know of other companies ferrying out work to other countries due to cost only to stop it due to bad results . All of the items fitted to my bike were as bad as the last ,the dealers dont know what to do because what they are fitting is just as bad .
Next the dealers talk about run out, one mill should be right nothing more nothing as bad as my last three wheels , two discs four pads one final drive and a remachined hub . As for the disc moving my caliper well bmw are lucky the caliper is a floating one other wise they would be stuffed it takes minutes for a caliper to cook itself!
I checked my front wheel neither the discs hub or rim show any runout horisontaly or laterally if it can be done on the front it can be done on the rear . This isnt a moan its just not right! a moan is what you do if theres nothing wrong. Im glad the MCN ran a short article i hope bmw take notice and do something .My dealership gave me an Akrapovic scilencer and my first service Foc when i said i still wasnt happy they were suprised like they thought it was all ok and i would go away. I will give it a few more months and see if the MCN runs another article giving numbers this time and we will see what bmw will do .



Ps I have owned and tuned many bikes .

 

[GrinningGSer]

FIXED!
new wheel bearing sorted the wheel issue

New carrier sorted the disk and caliper issue
The replacement carrier is the new type with an inboard water seal

The disk and caliper are now as sweet as a nut... as they should be !

 

[Panzer]

Wheel

Thats great so that will sort out my disc pushing my caliper about but i still have a square wheel ! When their quality control sorts out the wheels ill send mine in and get it sorted.
Cheers.

 

[csd4t]

What wheel bearing?

 

[GrinningGSer]

What wheel bearing?

Rear wheel bearing... or is it called the shaft bearing or final drive bearing...

Bearing Number 6 sorted the wheel movement and the carrier number 2 sorted the caliper

The carrier on late 07 and 08 GSA's has a rubber seal on the inbound side,to protect the final drive from water ingress, which does not show on this diagram. This is to help ford riding and all those on younger bikes should stay on dry land

A badly machined carrier will give you the visual symptoms of a warped disk and also could give the appearance of a warped wheel, but in my case the wheel issue was bearing related.

The carrier, which carries the rear wheel and the disk, is secured to the final drive with what looks like a big circlip

Dealers have only recently had a tool to replace the rear wheel bearing. Those that do not have the tool need to replace the entire final drive unless anyone knows different?

 

[D6]

i find it unbelievable that they were checked over before the buyer gets them and no one noticed, or were they told not to see it, i wonder?

 

[D6]

Irrespective of the make of vehicle, the caliper should not move when the wheel is rotating and the brakes are not being applied. If it does then there is a fault.

agree, judging by some of the run out stated, they are m o t failures

 

[Markgsxr]

This saga is still ongoing for some of us. Just an update for those having the same issues. Mine went into the dealers today who fitted a new wheel and disc, told me it was a different bike, the disc was warped and it was a bad wheel. Before I left I hoiked it onto its centrestand, started it and went straight back in. Two people came out and basically said "Oh" then "we've never seen this before" so now a final drive is on order. I keep referring them to this site but they dont appear interested. Heres a vid of the "fixed" rear end.

http://uk.youtube.com/watch?v=G17XdNiUhJo

Here#s the rear caliper. Not a good vid at all, camera a bit shaky but you can just see it still moves

http://uk.youtube.com/watch?v=36AcchfebN0

 

[GSmonkey]

Looks roughly the same as mine..................I think a trip to the stealers is in order

 

[The Nutter]

This is crazy i bought my 07 gsa in Nov i checked the rear wheel after reading something on our site about the wheels being out of line laterally and horisontaly it was so bad i have never seen anything like this , i rang the dealership and told them, the answer given was they know they have had problems just bring it back and they would swap it out i did this but thinking all would be fine after they refitted it i rode home and checked it only to find it was worse than the one they had replaced i spoke to them again asking if they had checked it after refitting they said it was intolerance (what F******* tolerance) this was really bad and i also noticed the disc was moving the caliper in and out on its floating pins as well still the same day i rode back and showed them they all agreed along with their technition that not only was not just the wheel out laterally and horisontally but the hub was not machined correctly and the drive unit was not correct aswell. The bike was picked up from my house refitted with a third rear wheel ,new disc, pads and final drive unit and returned a day latter (yesterday). On my inspection i was amazed that the wheel ,new disc and rear unit were as bad as before all of this has been definately swapped out as i had marked the items of change .I instantly called the dealership .They said that although they had carried out the work they were not satisfied with the items fitted and know exactly what i was upset with , i said how can anything this bad get through quality control and become fitted the bike they didnt know they aknowledged there is a problem with many 07 final drives and hub/wheel assemblies i said go to the show room and check an 08 model they said they had and it was as bad and they had submitted a PUMA fault thingy to BMW headquarters and my problem will be dealt with asap, i will wait and see. So i think all of us should check our rear wheels and hubs because they will deal with it but it seems its not just us 07s but 08s as well.. Good Luck!

Thank God for cast alloy!

 

[cusi]

Having seen the video I must say I am stunned. I've been riding bikes a long time and I have never owned an undamaged motorcycle with a rear wheel that had any run out. Last time I saw anything remotely that bad it was my missus on her treader with a ton of shopping and 2 snapped spokes.

I am not a whinger, but this goes against all basic engineering principles, and for any one to say it is acceptable or within limits is just waffle.

 

[Panzer]

Wheel !

Having seen the video I must say I am stunned. I've been riding bikes a long time and I have never owned an undamaged motorcycle with a rear wheel that had any run out. Last time I saw anything remotely that bad it was my missus on her treader with a ton of shopping and 2 snapped spokes.

I am not a whinger, but this goes against all basic engineering principles, and for any one to say it is acceptable or within limits is just waffle.

Yes i agree totally this is not acceptable it would be good when the mcn mentions those two videos on you tube as no one could ever argue that items like that should ever be fitted to anything if they do they are crackers !!!!!!!!!!!!!!!!!!!!

 

[Markgsxr]

My GSA is going in Wednesday for a new final drive unit to be fitted. I asked if it came with the disc carrier in case this was incorrectly machined but they couldnt tell me as he "hadn't seen the part".

So my fourth 30 mile round trip to get this sorted, fingers crossed!!
I put a dial gauge on and took some rough measurements, wheel moves 2.4mm and the disk .55. Not big numbers but looks worse "in the flesh"

 

[davegs]

MCN

I've stopped buying MCN for simple things like that and oh yes another reason..........................................................................it's crap.

I agree 100% buit I usually have a look at it in Sai.nsburys, don't take long but just in case theres something worth looking at, (theres not usually much so it don't take long!).
dave gs.