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Old 01-29-2013, 10:27 AM   #1
tar356 OP
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R1100 caliper question

I have an odd issue with the left front caliper on my '99 R1100. I can't seem to get the bleeder to stop weeping???

I flushed and bled the system recently, and was very careful not to overtighten the bleeder, but now it weeps just a bit around the threads. I'm wondering if the seat has been scored/galled from overtightening in the past? The bike has been serviced by dealership in the past...hmmm.

Anyone had a similar problem?? I'm thinking that if the seat area is bad, then I'll need another caliper, unless someone has a good solution.

Thanks
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Old 01-29-2013, 12:52 PM   #2
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Even though you already bled the system, I think your only choice is to pull the bleeder, check it, check the caliper also for scoring, and maybe try to replace the bleeder first, just to see.

My local AP store has metric bleeder nipples in stock, so you may find a test one cheap.
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Old 01-29-2013, 03:45 PM   #3
tar356 OP
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I should have added in my post that I've tried a new bleeder. I'm thinking it's scored down in the seat.

I may try and reface the seat in my mill.

Hate to buy another caliper, but....
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Old 01-29-2013, 05:52 PM   #4
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Try new copper washers?
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Old 01-29-2013, 05:54 PM   #5
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Try new copper washers?

no copper washers on bleeder
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Old 01-29-2013, 07:22 PM   #6
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Are you sure the weeping is ongoing? - it could be some residual liquid appearing to seep out for a few days. Give the area a good wash and see what it looks like after it's dried out.

If it really is weeping, there is a tool to recut/reface the seating surface in the bottom of the bleed nipple thread. You could also pull the nipple out to check for any grit or corrosion or perhaps a sliver of metal from a thread sitting across the seating surface.
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slartidbartfast screwed with this post 01-29-2013 at 07:28 PM
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Old 01-29-2013, 07:52 PM   #7
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slartidbartfast - my thoughts too...brake fluid is thin slippery stuff...could be residual coming down the threads from the new bleeder I installed. Everything is bone dry right now...will monitor.

I'm curious about the tool you mentioned....have any info?
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Old 01-29-2013, 08:19 PM   #8
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slartidbartfast - my thoughts too...brake fluid is thin slippery stuff...could be residual coming down the threads from the new bleeder I installed. Everything is bone dry right now...will monitor.

I'm curious about the tool you mentioned....have any info?
I'll be darned if I can find any reference to such a thing now (but I know I saw one somewhere before). There's also a repair kit where you drill the nipple hole oversize and tap for an NPT thread so you can screw in an insert with a new nipple in it. Google "nipple therapy"











... Maybe try "brake nipple therapy"
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Old 01-29-2013, 08:59 PM   #9
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You could thread an adapter/copper washer into the bleeder port and install a bleeder in the adapter. But, I would try your mill first....just a touch with a cutter to reface the nipple seat and you'll likely be fine....sorta like refacing an engine valve seat however, the angle is not as critical.

def screwed with this post 01-29-2013 at 09:11 PM
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Old 01-30-2013, 02:28 PM   #10
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Maybe a little teflon tape around the threads of the bleeder screw?
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Old 01-30-2013, 03:36 PM   #11
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Maybe a little teflon tape around the threads of the bleeder screw?
NEVER ever under any circumstances should you put Teflon tape on a tapered seat fitting. ALL of the seal needs to be on the tapered seat and NOT on the threads.

If you find a tapered seat ream in the size you need, I would remove the caliper and push out the pistons and make sure it is completely debris free and clean before reassembly. you would not want a small metal chip down in the seal of the caliper piston, tearing it and blowing your brake fluid out all over your pads...not to mention loosing all stopping pressure.

You probably already knew this, but worth a mention.

I was thinking if you took off the caliper, shined a small light in the bleeder port, you might be able to see the issue. Possibly...at your own risk of course, be able to take a drill bit JUST with your fingers though NOT a drill motor, and gently use the angle of the cutting edge of the drill bit to re-surface the taper, kind of like burnishing and ridge or burr off and then a fresh new bleeder screw and see if that works. Free too...except the new bleed screw..
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Old 01-30-2013, 03:41 PM   #12
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NEVER ever under any circumstances should you put Teflon tape on a tapered seat fitting. ALL of the seal needs to be on the tapered seat and NOT on the threads.
This needs further amplification.

As mentioned above, never use teflon tape on any brake system fitting. The teflon may come loose and cause brake failure.

Brake fittings should seat and be drip tight otherwise, repair appropriately.
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Old 01-30-2013, 03:48 PM   #13
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def,
Did I finally get something right?
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Old 01-30-2013, 04:09 PM   #14
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Just put a solid bolt in the hole.
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Old 01-30-2013, 07:30 PM   #15
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def,
Did I finally get something right?
Yes, BIG TIME!
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