Just a thought about rear end bearing failure - BMW Luxury Touring Community
 
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post #1 of 8 Old Jun 22nd, 2006, 12:48 am Thread Starter
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Just a thought about rear end bearing failure

This is pure speculation on my part and not backed by any hard facts just curiosity. Here goes. Is it possible that the rear end bearing failures could be related to the amount and/or severity of usage of the rear brake? I know the newer lt's have the intergrated brake system but the rear brakes can be applied seperately. So another part of the question would be how many that have experienced failures regularly use their rear brake primarily or initially? My thinking here is that the rear end could still be under load from the engine and suddenly the wheel is trying to stop. Wouldn't this put some unusual stress on the bearing? Especially in a panic situation. I have been schooled in the front brake only method of stopping with some exceptions. My LT is a 99 with low miles, 32000, so it is probably to early to be a statistic but so far so good. As I said, just curiosity and speculation on my part. I am not a mechanical engineer. Just a shade tree wrench. Your opines???
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post #2 of 8 Old Jun 22nd, 2006, 2:23 am
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Quote:
Originally Posted by retiredjj
This is pure speculation on my part and not backed by any hard facts just curiosity. Here goes. Is it possible that the rear end bearing failures could be related to the amount and/or severity of usage of the rear brake? I know the newer lt's have the intergrated brake system but the rear brakes can be applied seperately. So another part of the question would be how many that have experienced failures regularly use their rear brake primarily or initially? My thinking here is that the rear end could still be under load from the engine and suddenly the wheel is trying to stop. Wouldn't this put some unusual stress on the bearing? Especially in a panic situation. I have been schooled in the front brake only method of stopping with some exceptions. My LT is a 99 with low miles, 32000, so it is probably to early to be a statistic but so far so good. As I said, just curiosity and speculation on my part. I am not a mechanical engineer. Just a shade tree wrench. Your opines???
My opinion is that this is not a contributor from an alignment perspective, since the brake rotor is pretty close to the bearing. However, HEAT from more than normal rear brake usage could possibly bring on bearing failure a little faster, if it is heating up the disk carrier sufficiently. It would have to be pretty abnormal brake heating though, since the disk carrier is well heat sinked to the aluminum wheel.

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post #3 of 8 Old Jun 22nd, 2006, 2:54 am
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David covered your inital question, but I have to ask: why would you ignore a perfectly good rear brake? I know the fronts will give more stopping power due to dual rotors and normal weight transfer, but I just don't understand not using the rear regularly. Even with the Integral brakes on my '02, I still use both, and modulate them according to the road conditions and the severity of the stop. Plus frequent, firm use (and EBC pads) seem to minimize the dreaded squealing.

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post #4 of 8 Old Jun 22nd, 2006, 7:09 am
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I have heard of some people that will only use the front brakes. Me, I use both. I see no advantage in only using the front.

As David says the heat from the brake shouldn't be enough to cause the problem unless there is something really wrong with the brake. After reading about this problem for some time now I think it is just a quality control problem with the bearing. The mileage reports and people's stories of their failures sounds like there isn't much to say any one thing is the problem which leads me to the quality control issue.
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post #5 of 8 Old Jun 22nd, 2006, 7:17 am
 
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The same final drives fail on other BMW models as well as the LT.
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post #6 of 8 Old Jun 22nd, 2006, 8:02 am
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Quote:
Originally Posted by meese
David covered your inital question, but I have to ask: why would you ignore a perfectly good rear brake?
Ken,

Rear brakes are worthless during a "stoppie", not that I do that mind you.

John
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But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 8 Old Jun 22nd, 2006, 8:28 am
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Since we're on the subject...

On the 02 and forward , integrated, I was under the impression that using either the hand or footbrake, operated both brakes.

If I use both, yes, the brakes feel stronger, but I attribute that to having more total pressure on the brake system from the hand and foot. If I simply squeeze the lever harder (or step harder) it feels the same as using both.

So is there a difference, for example only certain pistons used?

Thanks,
Steve
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post #8 of 8 Old Jun 22nd, 2006, 12:24 pm
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Originally Posted by stevetree59
Since we're on the subject...

On the 02 and forward , integrated, I was under the impression that using either the hand or footbrake, operated both brakes.

Thanks,
Steve
Steve,

Yes and No. It depends on the amount of input pressure and input point. Very light application of the rear brake input only operates the rear brake. Any thing stronger and it applies front as well. Likewise for the front input circuit.

Timing is also involved as I found out flushing my system a few weeks ago. A steady light pull on the front lever actuates both front and rear pumps in the ABS unit. With no increase in pressure and after a few seconds the rear pump shuts down until I apply more pressure. Like wise for the rear input. The output pressure is also proportional to the input pressure. The harder you apply it the more you get from the "other" brake.

John
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2005 K1200LT Ocean Blue Blue Wizard 114 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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