Rear brake probs? - BMW Luxury Touring Community
 
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post #1 of 12 Old Aug 31st, 2008, 1:07 pm Thread Starter
 
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Rear brake probs?

Hi !

We've just bought a bmw K1200lt from the year 1999. When we are taking a curbe, the back brake makes a "rattling" sound. Hope I've wrote the right word for it, as I'm from Belgium, if not, I hope you understand what I mean.

I've called a bmw dealer, and he said it was normal. But when I went to visit another one, he said I had to replace the breakdisk.

Does anybody have some advice ?

Greets.
Isabelle
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post #2 of 12 Old Aug 31st, 2008, 1:27 pm
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Re: Rear brake probs?

Many describe the sound you are hearing as a "cowbell" sound. It is due to wear on the rivets that mount the rear disc and the only correct and long-term fix is to replace the disc. EBC is a european company that makes a replacement disc for this application and is quite a bit lower in price than the OEM piece from BMW. Not hard to install at all.

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post #3 of 12 Old Aug 31st, 2008, 2:23 pm
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Smile Re: Rear brake probs?

Hi Everybody,

I had mine (rear brake disk) changed under waranty just before reaching 40000km (not miles) because my LT was also under 4 yo (06/2004).

I don't know if this apply overseas

Gerard from Grenoble (France)
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post #4 of 12 Old Aug 31st, 2008, 7:28 pm
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Re: Rear brake probs?

Some of us have had the 10-point rear brake disk replaced under warranty with a new 5-point disk recently released by BMW. It solved my noise problems.
Apparently the dealers have a service bulletin that describes replacing the disk if the customer complains, but I don't know if its limited to more recent years or not. Either way, if it annoys you, get a new rear rotor (disk).

Chris
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post #5 of 12 Old Sep 1st, 2008, 5:00 pm
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Red face Re: Rear brake probs?

I found this one almost as hard to belive as the final drive failure issues. In fact two options for repair exist. One is to replace the brake rotor and the other is to replace the bike. The rotor is certainly the least expensive of the two and the one I chose. I was embarrassed to tell most of my friends who ride other brands since I have bragged on BMWs for the last 23 years but I did it anyway. I'm getting the hang of the ribbing because the noise that radiates from the rear brake every stop I make brings its fare share of digs anyway. The dealer replaced the disc for the cost of the disc. Good Luck!
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post #6 of 12 Old Sep 1st, 2008, 5:15 pm
 
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Re: Rear brake probs?

Hey All......Not trying to hijack.......rear brake prob seems good
Just admiring & checking the low parts of the bike......you know the ones you have to sit on the concrete to inspect.

So it seems my rear brake rotor has play??? I seem to remember something about this-obviousy a problem, but is this another common malady???

Mike
yeah I didn't do a search.

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post #7 of 12 Old Sep 1st, 2008, 8:52 pm
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Re: Rear brake probs?

Call me cheap, call me foolish: I put a rag on the disk under the rivets/bolts and hit the shank of them the best I can with the nozzle on a can of WD-40 (I don't get wild with it and I move the disk back and forth to displace the fluid). Wipe it off the best I can, take it out for a ride and burn-off any oil that may have got on the pads/disk.

Quiet now, but after the next wash or some miles, will have to hit them again. But it's quiet. I'm waiting on those that have changed to the newer disks and pads before I change it/them.

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post #8 of 12 Old Sep 2nd, 2008, 5:43 am
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Re: Rear brake probs?

Quote:
Originally Posted by wacolt
Call me cheap, call me foolish:
OK, you're cheap and foolish..
Quote:
Originally Posted by wacolt
I'm waiting on those that have changed to the newer disks and pads before I change it/them.
to do what.. tell you to do it??? DO IT! (it really is worth it...)

Chris
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post #9 of 12 Old Sep 2nd, 2008, 6:39 am
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Re: Rear brake probs?

I found this excerpt from an article after I googled, "K1200LT Floating Disk".

"Rear brake squeaking is something a lot of K1200LT owners seem to complain about. Mine did it too; sounded like a flock of angry geese whenever the rear brake was applied. My mechanic removed the pads and roughed them a bit because they were showing some glazing. This seems to have cured the problem, at least for now. Apparently the rear brake on the K1200 incorporates a floating disk. According to my mechanic, the noise may be coming from lateral movement of the disk itself on the mounting studs as a result of irregular gripping by the pads when they become glazed. Seems like there ought to be a way to lube those studs to prevent the noise, if that is what causes it."

Taking this into account, I have a new set of pads and will change them out, bed them in, and hope they don't glaze. If the glazing causes irregular gripping of the disk, 10-pt or 5-pt disk won't make any difference.

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post #10 of 12 Old Sep 9th, 2008, 3:08 pm Thread Starter
 
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Re: Rear brake probs?

but it's not squeeking. It's making sound without us breaking.
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post #11 of 12 Old Sep 9th, 2008, 6:35 pm
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Re: Rear brake probs?

Isabelle
pastor jack answered your question, if it wories you replace the disc, I doubt that you can get any type of comeback on bmw your bike is well out of any warranty, It seems to be a common wear item, I have replaced mine with an ebc and have not had any problems since. it will rattle for ever until you replace or repair it, as some people have done. and you should replace the pads as well if you go the replacement route. but there is no need to panic it is not usually unsafe.

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post #12 of 12 Old Sep 9th, 2008, 8:26 pm
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Re: Rear brake probs?

Quote:
Originally Posted by wacolt
I found this excerpt from an article after I googled, "K1200LT Floating Disk".

"Rear brake squeaking is something a lot of K1200LT owners seem to complain about. Mine did it too; sounded like a flock of angry geese whenever the rear brake was applied. My mechanic removed the pads and roughed them a bit because they were showing some glazing. This seems to have cured the problem, at least for now. Apparently the rear brake on the K1200 incorporates a floating disk. According to my mechanic, the noise may be coming from lateral movement of the disk itself on the mounting studs as a result of irregular gripping by the pads when they become glazed. Seems like there ought to be a way to lube those studs to prevent the noise, if that is what causes it."

Taking this into account, I have a new set of pads and will change them out, bed them in, and hope they don't glaze. If the glazing causes irregular gripping of the disk, 10-pt or 5-pt disk won't make any difference.
I don't believe that glazed pads is the issue. My rear brake squealed from the day I left the dealer's lot. I got the 10 bolt rotor replaced with the 5 bolt (at not cost other than the 100 mile ride to the dealership). The dealer told me that BMW would NOT pay also for new pads, but I didn't care as I had only about 7,000 miles at that point and they weren't worn badly at all.

The squeal was gone immediately and this was with the exact same brake pades. I just don't believe the pads are the root cause. They may contribute and I don't doubt that pads with a greater or less coefficient of friction might alter the noise, but I tend to believe it is what BMW says it is and that is a resonance set up in the rotor. The new design supposedly moves the resonant point to a frequency that is no longer excited by braking at low speeds.

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