Brake Caliper Bleed Screws won't stop leaking - BMW Luxury Touring Community
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post #1 of 9 Old Jun 4th, 2015, 11:09 am Thread Starter
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Brake Caliper Bleed Screws won't stop leaking

I just completed the annual service on my 2005 LT. This included the installation of new brake pads and the annual brake flush.
Back story… Several years ago, after reading threads on this forum about speed bleeders, I purchased a complete set of the screws for my bike. I later determined that they aren't really needed to perform the flush, so I never installed them.

So fast forward to last week, I find the unopened bleed screws in the original packaging and in a moment of brilliance, I decide that it would be a good idea to install them on the bike. I completed the install and system flush with no problems, at least I thought. I went out for a ride and noticed leakage from the bleed hole (not threads) on both rear caliper bleed screws. I tightened them down more, still they leaked. So I decided to place the original screws back in the caliper… now they are leaking as well (from the bleed hole, not the threads). I can’t torque them down any further. Prior to this situation, I’ve never had leak issues with the bleed screws.
My concern is, Why is it leaking from the bleed hole, but not the threads, and how do I make it stop?

Options I’m thinking about:
1) Putting thread sealant on the original screws and reinstalling.
2) I have another set of unopened speed bleeders, SB1010, not the SB1010S that I could try. The SB1010 is a longer screw.
3) Ordering replacement OEM screws.

Thoughts?????

Thanks in advance.

Bob

2005 Blue K1200LT
2010 R1200GS
BMW/MOA 94539


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post #2 of 9 Old Jun 4th, 2015, 11:29 am
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Re: Brake Caliper Bleed Screws won't stop leaking

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Originally Posted by bob1811 View Post
I just completed the annual service on my 2005 LT. This included the installation of new brake pads and the annual brake flush.
Back story… Several years ago, after reading threads on this forum about speed bleeders, I purchased a complete set of the screws for my bike. I later determined that they aren't really needed to perform the flush, so I never installed them.

So fast forward to last week, I find the unopened bleed screws in the original packaging and in a moment of brilliance, I decide that it would be a good idea to install them on the bike. I completed the install and system flush with no problems, at least I thought. I went out for a ride and noticed leakage from the bleed hole (not threads) on both rear caliper bleed screws. I tightened them down more, still they leaked. So I decided to place the original screws back in the caliper… now they are leaking as well (from the bleed hole, not the threads). I can’t torque them down any further. Prior to this situation, I’ve never had leak issues with the bleed screws.
My concern is, Why is it leaking from the bleed hole, but not the threads, and how do I make it stop?

Options I’m thinking about:
1) Putting thread sealant on the original screws and reinstalling.
2) I have another set of unopened speed bleeders, SB1010, not the SB1010S that I could try. The SB1010 is a longer screw.
3) Ordering replacement OEM screws.

Thoughts?????

Thanks in advance.
I never bought speed bleeders as they are entirely unnecessary. I also read somewhere that some of them didn't fit right and needed to have the point filed off of the tip or something goofy like that. I wonder if you damaged the sealing surface in the calipers by installing the ill fitting speed breeders? Hopefully, someone here who has installed them successfully can give you some ideas.

For me, the cheap bleeder bag was a far better deal and just as effective as the speed bleeders and I got to keep the original bleed valves that work and seal just fine. I always prefer to apply Occam's razor and go for the simplest solution possible.

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post #3 of 9 Old Jun 4th, 2015, 11:47 am
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Re: Brake Caliper Bleed Screws won't stop leaking

Lots of info on the net on this. Just google it. Most likely report was dirt on the caliper surface were the bleeder meets it, that's what makes the seal. You need to check each surface of the screw and caliper to make sure they are intact. I bought BMW bleeder screws after removing the factory fillers and they sealed good. May have to take the caliper off to inspect the mating surface. Hope this helps. A more knowledgeable mechanic with first hand experience will help.

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post #4 of 9 Old Jun 4th, 2015, 12:29 pm Thread Starter
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Re: Brake Caliper Bleed Screws won't stop leaking

My apologies if I was not clear on the issue at play here. The leak is not from the threads of the screw (in either the speed bleeders or OEM screws), but from the bleed opening hole at the top of the screw (where the fluid comes out). I determined this when after install, I removed the rubber dust cap and fluid came out of the top of the cap. it's a small amount, but it's leaking and I'm trying to get it to stop.

Bob

2005 Blue K1200LT
2010 R1200GS
BMW/MOA 94539


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post #5 of 9 Old Jun 4th, 2015, 2:58 pm
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Re: Brake Caliper Bleed Screws won't stop leaking

I believe that's what Moogie was addressing. If the bleeders don't make a good seal when turned in they will leak out the hole.

Speed bleeders have been known to have an issue with sealing. If you over torqued the speed bleeders you may have damaged the sealing surface in the caliper's holes. A really good machinist may be able to clean them up.
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post #6 of 9 Old Jun 4th, 2015, 7:57 pm
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Re: Brake Caliper Bleed Screws won't stop leaking

Completely remove the bleed screw and make sure there is no leftover thread sealer down in the hole (clean it with a Q-tip) from the Speed Bleeders. Then make sure the tip of the bleed screw is clean and smooth and re-install. Also look at the threads to make sure they are clean as well.

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post #7 of 9 Old Jun 4th, 2015, 8:23 pm Thread Starter
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Re: Brake Caliper Bleed Screws won't stop leaking

Thanks to everyone for the responses. I'll pull the screws and clean them up and reinstall as suggested. I'll let you know how it works out.

Thanks!

Bob

2005 Blue K1200LT
2010 R1200GS
BMW/MOA 94539


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post #8 of 9 Old Jun 6th, 2015, 7:17 am
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Re: Brake Caliper Bleed Screws won't stop leaking

I had a bleeder screw on the rear caliper leak after doing the Speigler line change when filling the system. I ended up running a tap thru and replacing with a new bleeder. Leak fixed.

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post #9 of 9 Old Jun 6th, 2015, 10:35 am Thread Starter
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Re: Brake Caliper Bleed Screws won't stop leaking

I took John's advice and cleaned up the thread lock residue from the speed bleeders. It seems to have worked...
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Bob

2005 Blue K1200LT
2010 R1200GS
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