Clutch slave cylinder failure MTBF - BMW Luxury Touring Community
 
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post #1 of 10 Old Nov 21st, 2014, 2:38 am Thread Starter
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Clutch slave cylinder failure MTBF

I have a 2000 LT with 92K. I experienced a clutch slave cylinder failure at about 70K and had Bob's put in a new one and a clutch pack. I have looked over the site and cannot find any information regarding the expected life of the slave cylinder.

I am also getting a bit tired of looking at my 2000 and thinking of getting a later model LT. I would like to think that I would not have to replace another one so I am curious about the time between failures of the slave cylinder. Was this a failure that only occured in earlier models? Did BMW come up with a better design?

Any failure information would be appreciated along with your thoughts on upgrading to al later model.
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post #2 of 10 Old Nov 21st, 2014, 5:06 am
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Re: Clutch slave cylinder failure MTBF

I'm sure John Zieler will chime in on this, he has information regarding an upgrade that occurred I think around 2004. As for the MTBF, I too am unsure so I purchased a new slave unit from BBY (genuine Magura part) recently and intend to install it around the 50,000 Km mark. My '05 is currently around 46,000. As for the failure mode, it is generally thought that the thrust bearing runs out of lube (grease) then seizes and causes the slave piston to spin in the cylinder bore which then takes out the piston seal and wrecks the bore allowing the fluid to leak along the clutch push rod and, if you're really unlucky, wet the clutch. I intend to perform an autopsy on the slave I remove as I'd like to be able to either replace the thrust bearing or at least re-lube it. Unfortunately with this clutch design, the slave never gets a rest, it (the thrust bearing)rotates whenever the engine is running, with higher thrust loads encountered when the clutch lever is pulled in. HTH

Dennis
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post #3 of 10 Old Nov 21st, 2014, 7:41 am
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Re: Clutch slave cylinder failure MTBF

I believe that the slave cylinder was redesigned sometime late 2000 or 2001. David Shealey (sorry for the spelling David) may have more information on it.
When Bob's changed out your clutch, I sure hope that they changed the rear main seal, which I am sure that they did.

Mike Trevelino
Williamsburg, VA
2008 RT
2000 LT - Totaled at 99,960 miles


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post #4 of 10 Old Nov 21st, 2014, 12:31 pm
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Re: Clutch slave cylinder failure MTBF

The slave design changed slightly after April of 04 as this was my 05's manufacture date and I had the old style. At 18K I had a warranty replacement of the transmission output seal and I asked them to replace the slave and I kept the old one. It has a conventional C clip retaining the piston. The new style has a much larger clip retaining the piston with no other visible differences. It has been in there for 78K and no leaks. Don't know if it was improved but it was changed.

John
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post #5 of 10 Old Nov 22nd, 2014, 1:17 am
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Re: Clutch slave cylinder failure MTBF

Thats interesting John.
My manufacture date is (I think) the same (April 04). I had a clutch change at 16k km (burnt out, sometime around late 2006?) under warranty... maybe they changed the slave to new design at the same time...?
When we recently did my clutch at 106k km, we just popped the same slave back on as it seemed fine as far as we could tell. Now I'd like to know... but damned if I'm going back in there before I need to again (never I hope).

Chris
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post #6 of 10 Old Nov 22nd, 2014, 6:47 am
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Re: Clutch slave cylinder failure MTBF

I've seen them leak at 30,000 miles. I change mine at around 70,000 miles even though I have added the drain hole. It only takes a few hours.

Dave Selvig
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post #7 of 10 Old Nov 22nd, 2014, 11:40 am
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Re: Clutch slave cylinder failure MTBF

Most dealers will not replace a non-failed part during a warranty repair. So if it was not leaking then they probably did not replace it.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #8 of 10 Old Nov 22nd, 2014, 4:26 pm
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Re: Clutch slave cylinder failure MTBF

My 2002 went at about 35K miles. Luckily it didn't wet the clutch when it went.

Steve Green
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post #9 of 10 Old Dec 8th, 2014, 3:44 pm Thread Starter
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Re: Clutch slave cylinder failure MTBF

Quote:
Originally Posted by K100Dennis View Post
I'm sure John Zieler will chime in on this, he has information regarding an upgrade that occurred I think around 2004. As for the MTBF, I too am unsure so I purchased a new slave unit from BBY (genuine Magura part) recently and intend to install it around the 50,000 Km mark. My '05 is currently around 46,000. As for the failure mode, it is generally thought that the thrust bearing runs out of lube (grease) then seizes and causes the slave piston to spin in the cylinder bore which then takes out the piston seal and wrecks the bore allowing the fluid to leak along the clutch push rod and, if you're really unlucky, wet the clutch. I intend to perform an autopsy on the slave I remove as I'd like to be able to either replace the thrust bearing or at least re-lube it. Unfortunately with this clutch design, the slave never gets a rest, it (the thrust bearing)rotates whenever the engine is running, with higher thrust loads encountered when the clutch lever is pulled in. HTH
Thanks for the detailed explanation of the operation of the slave cylinder. I guess it pays to NOT keep the clutch lever in any longer thatn required while stopped. Bob's did replace the rear main seal while in there and pretty much took care of all they found during disassembly.

Sorry for the late reply but I have been caught up in a refueling outage at the nuclear power plant where I work.
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post #10 of 10 Old Dec 8th, 2014, 7:30 pm
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Re: Clutch slave cylinder failure MTBF

Quote:
Originally Posted by theverns View Post
Thanks for the detailed explanation of the operation of the slave cylinder. I guess it pays to NOT keep the clutch lever in any longer thatn required while stopped. Bob's did replace the rear main seal while in there and pretty much took care of all they found during disassembly.

Sorry for the late reply but I have been caught up in a refueling outage at the nuclear power plant where I work.
Lever in - lever out the bearing (and release rod) are always rotating if the engine is running. The spring in the slave keeps pressure on the rod all the time. Just more when you hold in the lever.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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