Rattly front disc!

[Redsprocket]

Hi all,

A little advice needed please.

I've a 2003 ADV with ABS and servo, and have found when I washed the bike yesterday, I appear to have a full floating front disc ie it rattles! now, it wasn't like that!

Having had a quick look on here, it would appear to be the washer or bobbin has worn, how can I tell?
The other question is, can I ride it or do I need the washer/ bobbin replacement as a saftey item, before I go out again?

Its Ok its not sunny out there for a ride, oh hang on.............bugger

Many thanks for any wisdom

David

 

[Steptoe]

Having had a quick look on here, it would appear to be the washer or bobbin has worn, how can I tell?

You've answered your own question - The disc rattles .................. .

You can ride with it with any problems , but the longer you leave it with movement the disc mounting holes will wear oval, so the new washers won't last very long

 

[motoscot]

DISC RATTLE

yes its safe to ride , but need to replace buttons to save wearing the stems on the wheel
get a disc button repair kit from james sherlock , easy to replace

Steve

 

[DrFarkoff]

get 10 x stainless washers as fitted to R1150R on the inside of the bobbin this will stop the disc wearing the wheel OR if it has it will stop further damage

I've done this to a couple of bikes now and it solves it LINKY

No....Description.....Qty...........Part Number

02.....Stop disc .........5.............34117670217

10 needed for 2 sides

 

[Redsprocket]

You've answered your own question - The disc rattles .................. .

Ah yes so I have, should be a mechanic me..................


Many thanks for the replies, I'll order the parts today.

David

 

[warmshed]

Wont washers just restict the lateral mevement? Dont The worn bobbins/discs give rise to radial movement?? I thought the idea of floating discs was to allow lateral movement?

 

[Jimbike]

I thought my discs rattled, on the 850R, because I was riding up a rocky mountain track in the Alps!

I'm glad I've sold it now or I'd have to replace them.
You learn something everyday.

 

[Steptoe]

Wont washers just restict the lateral mevement? Dont The worn bobbins/discs give rise to radial movement?? I thought the idea of floating discs was to allow lateral movement?

They aren't floating discs - they don't have bobbins. They are bolted direct to the wheel.

 

[phooey]

Not sure exactly which items are worn here but to ride the bike legally speaking....

Every part of every braking system must at all times be in good working order and properly maintained.

If it isn't designed to wear - eg friction material, and it has worn consider whether it falls foul of Construction & Use regs.

 

[DrFarkoff]

The Bobbins bolt directly to the wheel mounts

The wheel corrodes and it also gets worn by the wavey washers on the outside of the disc but inside the bobbin putting a load on the disc to prevent it rattling

The "Shim" washers I have suggested are very thin stainless and mount between the wheel and the bobbin and just allow the disc not to travel onto the worn wheel mount area

Hey presto balance is restored and even better it's genuine parts

 

[warmshed]

The disks have the wavy washers to allow lateral movement, albeit semi floating, not fully floating on yours. The wavy washers allow the disks movement to line up correctly, the bolts are shouldered to allow this movement whent bolted up tight. If you have excess movement and decide to place shim washers in, make sure you still have movement. You may find new wavy washers are all you need.


To answer Steptoe's remark, I was replying to redsprokets information that he had Fully floating disks fitted, though what I said still relates to semi floating disks he has, solid bolted up disks do not have movement unless the bolts are loose!

 

[Steptoe]

To answer Steptoe's remark, I was replying to redsprokets information that he had Fully floating disks fitted, though what I said still relates to semi floating disks he has, solid bolted up disks do not have movement unless the bolts are loose!

He doesn't have floating or semi floating discs on an 1150 adv.

None of the GS discs float, semi or other wise. they are bolted direct to the wheels and the bolts have shoulders to locate and fix the disc and should have no movement anywhere.

 

[Readz]

Hi all,

A little advice needed please.

I've a 2003 ADV with ABS and servo, and have found when I washed the bike yesterday, I appear to have a full floating front disc ie it rattles! now, it wasn't like that!

Having had a quick look on here, it would appear to be the washer or bobbin has worn, how can I tell?
The other question is, can I ride it or do I need the washer/ bobbin replacement as a saftey item, before I go out again?

Its Ok its not sunny out there for a ride, oh hang on.............bugger

Many thanks for any wisdom

David

I had the same problem and tried most of the above I ended up buying a used set of discs from Motoworks and was sorted. One disc was slightly warped, you really couldnt tell, I had both discs checked out by the lads at work with some good equipment and one was very slightly out. Instantly sorted with the new ones, pads were ok and washers were ok.

 

[zdaveuk]

found i had the same problem on my 2002 GS ADV

and bought these
Part No.20740 http://www.motobins.co.uk/bmw-parts.php?model=R850%20R1100%20R1150

and cured it

 

[warmshed]

He doesn't have floating or semi floating discs on an 1150 adv.

None of the GS discs float, semi or other wise. they are bolted direct to the wheels and the bolts have shoulders to locate and fix the disc and should have no movement anywhere.

I must disagree. The bolts are shouldered, when done up tight to the shoulder with the correct wavy washer it allows the disc move laterally by approx 30thou. (sorry still imperial) Just checked 2 bikes in case I remembered incorrectly.
In my book that's semi floating not fixed!

If the disc was bolted tight to the wheel and "have no movement anywhere." they would not have shoulders on the bolts..

If I am wrong perhaps you could explain what I am misinterpreting.

 

[Steptoe]

I) Just checked 2 bikes in case I remembered incorrectly.
.

Both your discs are fecked

I've just checked half a dozen bikes, no floating .

 

[Boxergs]

[QUOTENone of the GS discs float, semi or other wise. they are bolted direct to the wheels and the bolts have shoulders to locate and fix the disc and should have no movement anywhere.[/QUOTE]

Surely the fact that the wavy washers are fitted would indicate that the discs should flex/move slightly...so, if my (new) discs rattle, despite the wavy washers and bobbins being replaced then what to do? By the way, the rattle is caused by radial movement rather than lateral.

Jaythro's suggestion sounds good and I'd rather fit them than file the shoulder's on the wheel as I've read other's have done. But does it stop the radial movement?

 

[Dazlove]

[QUOTEJaythro's suggestion sounds good and I'd rather fit them than file the shoulder's on the wheel as I've read other's have done. But does it stop the radial movement?

DO NOT FILE THE SHOULDERS ON THE WHEEL!

The shoulders are integral to the hub and are obviously manufactured to very fine tolerances. Best will in the world 'hand filing' these shoulders to remove the 'lump' will not be anywhere near the correct tolerances.

If you do file the shoulders it will cure the rattle but within a few weeks your discs will be warped.

This I can tell you from experience. My discs were rattling but original and still in good condition even at 100k. My ears got the better of me and what with finding the post on filing the hub, attacked the shoulders, only removing just enough material to make them flat again. Great......for 2 weeks, then both discs warped and since this was caused by the hub, the only option was to replace the front wheel and both discs.

Still can't help thinking the repair had the right idea, so maybe if the offending hub was properly and accurately machined flat it may have worked wihout further repercussions.

Regards

Dazlove

 

[warmshed]

Both your discs are fecked

I've just checked half a dozen bikes, no floating .

Steptoe, you may work on GS bikes but it is dissapointing, no worrying, that you dont know that the reason for the shouldered bolts and the wavy washers is to allow movement.

It seems you have just looked at "half a dozen" faulty bikes if the disks are solid. Anyone reading this can check their bikes and see that the discs do float about 30thou, a press on the top of the disc while looking at an adjacent bolt will allow you to see this flex. IT IS NOT "FECKED"

 

[Steptoe]