how about playing name that fluid - BMW Luxury Touring Community
 
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post #1 of 8 Old Aug 17th, 2013, 9:17 pm Thread Starter
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how about playing name that fluid

While putting on front wheel the bike was up on center stand used a jack to put the front up just enough to get wheel off. When I was putting it on I noticed a clear oily fluid in a puddle as big as a saucer right underneath the breather tube that is at the front of the back wheel. Was it brake fluid if so where from? I did use a C clamp to push in the pistons on the brakes so I could get the wheel back on. Who's the 1st to play Name that Fluid...

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post #2 of 8 Old Aug 17th, 2013, 9:25 pm Thread Starter
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Re: how about playing name that fluid

"The reason for the slowly part was you are pushing fluid back into the ABS unit and it could overflow and make a mess. " This from John Baker from my other thread. John I think you may have won "Name that Fluid"...

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post #3 of 8 Old Aug 17th, 2013, 10:20 pm
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Re: how about playing name that fluid

I've done the same thing on my RT. If the brake fluid reservoir is topped off and you push 8 brake pistons back into the calipers, this will overflow the reservoir and the excess will end up on the floor. Next time you do the brake fluid flush, put the funnel on the reservoir, then push the brake pistons back into their bores. You'll see just how much brake fluid is held in the calipers.

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post #4 of 8 Old Aug 17th, 2013, 10:25 pm
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Re: how about playing name that fluid

Quote:
Originally Posted by TeddyTelco
"The reason for the slowly part was you are pushing fluid back into the ABS unit and it could overflow and make a mess. " This from John Baker from my other thread. John I think you may have won "Name that Fluid"...
Teddy,
Lift the seat and look down on the left side at the top of the ABS unit, if it is looking wet you found the source.

John Baker

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post #5 of 8 Old Aug 17th, 2013, 10:37 pm Thread Starter
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Re: how about playing name that fluid

I looked under seat can't see anything past the battery. Did I blow a seal or do I just need to top it off. Pretty sure it's brake fluid

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post #6 of 8 Old Aug 17th, 2013, 11:31 pm
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Re: how about playing name that fluid

On top of the ABS unit there will be 2 quarter size caps that have allen wrench sockets. These caps have hoses attached to their sides. These two hoses connect somewhere down below and become one, and I imagine from this one hose your brake fluid is draining from. You didn't blow any seal. And you don't need to do anything really. But the hose will continue to drip a bit of fluid until the hose is drained. Just remember that brake fluid damages paint, so any that drips on the rear wheel might damage the finish. If when you pushed the brake pistons back, and a lot of brake fluid was pushed into the hose, it is possible that the reservoir might be low when the pistons returned to their original positions. If the fluid is very low the ABS light will start flashing. If the light doesn't flash then the fluid level is ok. If you want you can unscrew the plastic caps with the appropriate allen wrench to see the brake fluid level. The bigger reservoir is for the front brakes.

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post #7 of 8 Old Aug 18th, 2013, 8:56 am
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Re: how about playing name that fluid

The front brake wheel circuit uses one of the rear reservoirs. Both rear reservoirs have overflow hoses that snake down to the front right side of the rear wheel. When you pushed the front caliper pistons back in, you overflowed the reservoir. I trick I learned here is when I bleed the brakes I take those overflow hoses and dip them into a bottle of fresh DOT 4 fluid so it refills the reservoir as I bleed away.

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post #8 of 8 Old Aug 18th, 2013, 11:38 am
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Re: how about playing name that fluid

Quote:
Originally Posted by Jim_McG
The front brake wheel circuit uses one of the rear reservoirs. Both rear reservoirs have overflow hoses that snake down to the front right side of the rear wheel. When you pushed the front caliper pistons back in, you overflowed the reservoir. I trick I learned here is when I bleed the brakes I take those overflow hoses and dip them into a bottle of fresh DOT 4 fluid so it refills the reservoir as I bleed away.

His is an 09 so both the wheel circuit reservoirs are ON the ABS unit. He has one small one behind the pannier for the rear control circuit (not monitored). Fo the 05 and up it is best to set the level in these reservoirs with the caliper pistons fully retracted. Then pump the pistons out. They are not as sensitive as the early bikes and using this method when you get the wig wag lights your pads are worn out. No need to add fluid between flushes like the 2001-2004 bikes.

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