I have an 06 GS with 10k miles that has developed a front end judder under braking. I assumed the front discs were warp so replaced them and the pads but i still have the same problem. The problem is only apparent when braking from high speeds. Any thoughts on what it might be?
Front end vibration when braking
- Thread starter dxwalt
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Ropey
Registered user
If linked brakes could the rear disc be warped?? 
Ropey
Registered user
Sorry just re-read your post again... DOH!!
MickyBlueyes
Registered user
I think I have exactly the same symptoms with my 05' 15k miles GS with ABS. I do not remember it being there before the dealer had it on the latop to check the system was bled properly as my rear brake felt spongey after they did the fluid change service.
I have my suspicions that it is an electrickery issue and was going to speak to my stealer about it, but open to other suggestions
I have my suspicions that it is an electrickery issue and was going to speak to my stealer about it, but open to other suggestions
front end shakes
if you`ve had the disc`s changed and know they are running true, then check wheel spindle,wheel bearings then work your way up checking all the pinch bolts and head race bearings, some early gs`s use to loosen the pinch bolts off , have fun
if you`ve had the disc`s changed and know they are running true, then check wheel spindle,wheel bearings then work your way up checking all the pinch bolts and head race bearings, some early gs`s use to loosen the pinch bolts off , have fun
RickG
Registered user
You need to do a search on 'brake judder' or 'warped disks', this is a much reported issue and there are probably hundreds of posts on it. Lots of disks replaced by dealers and theories why it happens.
I'd also check the front wheel is properly balanced as this can sometimes only show up under braking.
I'd also check the front wheel is properly balanced as this can sometimes only show up under braking.
Deleted account 211025001
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Do you mean 'front end judder' ie you feel it through the bars or is it felt through the brake lever
Andres
Andres
MickyBlueyes
Registered user
I don't feel it specifically through the lever it's more the bars as a whole inc the lever if that makes sense.
Having read back it looks like a disc/pad/bobbin or washer issue, will have to contact stealer. At least mine is under warranty
Having read back it looks like a disc/pad/bobbin or washer issue, will have to contact stealer. At least mine is under warranty
Deleted account 211025001
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I've been through a few sets of front discs and one rear but I've always only felt it through the lever and only during light braking at 'town' speeds. That seems to be a common theme to those that have suffered warped discs.
Andres
but I've always only felt it through the lever and only during light braking at 'town' speeds. That seems to be a common theme to those that have suffered warped discs.Andres
Sorry just re-read your post again... DOH!!
If they are linked then it will be the rear disc that's causing the problem.
I had 2 sets of discs replaced on my 06 1200 under warranty.
Mine did as you say slowing from speed, perhaps at the end of a dual carriageway or slowing to a m/way junction, it also seemed worse as the weather got better.
The disk mounts on my 09 are completely different so I guess there is a modification although I am not sure if it could be applied to earlier bikes.
Speak to your dealer as it is a known issue with the mounting bobbins.
Mine did as you say slowing from speed, perhaps at the end of a dual carriageway or slowing to a m/way junction, it also seemed worse as the weather got better.
The disk mounts on my 09 are completely different so I guess there is a modification although I am not sure if it could be applied to earlier bikes.
Speak to your dealer as it is a known issue with the mounting bobbins.
The vibration / judder is in the handlebars and not the brake lever. As the bike has ADS / servo brakes I guess it is unlikely that much would be felt through the brake lever. If the brake discs are straight ( only 300 miles on new ones) then there must be another cause. Is it possible that the ABS could induce this effect? The dealer check my original discs and said they were within BMW tolerence, i did however change them as i couldn't imagine what else would cause the front end juddering. If the rear disc were warped could it cause the system pressure to fluctuate and effectively induce a pumping pressure on the front brakes and the resultant judder???
RickG
Registered user
There is the suggestion that is not the disks themselves but the mounting ie the bobbins. Your new disks may be perfectly flat but if they are not mounted parallel to the wheel or not concentric to the axle you may get judder. Ideally you need to check the run-out with a dial gauge yourself, or simply firmly tape a stiff wire to a fork leg and bend it so it just brushes the disk - then slowly spin the wheel to see if the contact is even, both on the side of the disk to see if is moving from side to side and on the edge to see if moves up and down
My front end started to judder on the brakes just as you describe after only about 2k. I ignored it and by 10k it dissappeared completely, 75k later it's still fine. I have no idea what was going on to cause this.
I also still suggest you check the front wheel balance.
WindyChuffer
Registered user
+1 on checking the wheel balancing.
Additionally, the mounting bobbins could also be the cause.
You might find the following info of use:
There are two types of front disk fitted to the 1200GS.
Newer R1200GS bikes have the bobbins pre-mounted to the disk, and the disks float. Integrated bobbins.
On older 1200GS bikes, the mounting bobbins are assembled when you fit the discs from the fitting kit, and its all held in place by the disk mounting bolts. I think there is less disk float with this system.
I think the changeover was for the 2008 model year (so end 2007).
Newer disks can be fitted to older bikes and vice versa, but the new system is better so I led to believe; less brake disc warping etc.
I only found this out when was trying to source discs for a 2nd set of wheels for my GSA in May. At the time, you could only get the newer style disc from BMW, and only the older style was available aftermarket (EBC, Wave etc). Of course you pay a price premium for BMW components...
So if you do end up changing your front brake discs, would recommend you go for the newer floating type with integrated bobbins.
Additionally, the mounting bobbins could also be the cause.
You might find the following info of use:
There are two types of front disk fitted to the 1200GS.
Newer R1200GS bikes have the bobbins pre-mounted to the disk, and the disks float. Integrated bobbins.
On older 1200GS bikes, the mounting bobbins are assembled when you fit the discs from the fitting kit, and its all held in place by the disk mounting bolts. I think there is less disk float with this system.
I think the changeover was for the 2008 model year (so end 2007).
Newer disks can be fitted to older bikes and vice versa, but the new system is better so I led to believe; less brake disc warping etc.
I only found this out when was trying to source discs for a 2nd set of wheels for my GSA in May. At the time, you could only get the newer style disc from BMW, and only the older style was available aftermarket (EBC, Wave etc). Of course you pay a price premium for BMW components...
So if you do end up changing your front brake discs, would recommend you go for the newer floating type with integrated bobbins.
MickyBlueyes
Registered user
Well it turns out that the vibration on mine is warped front discs. Which are to be replaced under warranty with the
newer type mountings. Hopefully this sorts it either that or it'll need a rear disc as well.
My wheels are well balanced as not so long since had new tyres and none of the weights have fallen off, and the vibration started a couple of weeks after the new tyres went on with no vibration just after fitment.
So anyway fingers crossed on mine the new disks/bobbins on the front woll sort it.
newer type mountings. Hopefully this sorts it either that or it'll need a rear disc as well.
My wheels are well balanced as not so long since had new tyres and none of the weights have fallen off, and the vibration started a couple of weeks after the new tyres went on with no vibration just after fitment.
So anyway fingers crossed on mine the new disks/bobbins on the front woll sort it.
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