K1200RS front right caliper filler adapter & grub screw stripped - K-Bikes.com - Excellence in Motion
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post #1 of 29 (permalink) Old Apr 25th, 2008, 2:56 am Thread Starter
 
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K1200RS front right caliper filler adapter & grub screw stripped

In bleeding my front right brake caliper on the 99 K1200RS, I stripped what appears to be called the "filler adapter" on the front right caliper.

Does anyone know what the purpose of this "filler adapter" is? The left side does NOT have the filler adapter. The shop manual (page 00.43) shows a "grub screw" in the filler adapter; but I don't appear to have this grub screw. I just have the bleeder valve screwed into this filler adapter.

Since the filler adapter female aluminum threads are stripped, I tried to remove the filler adapter, but, it doesn't seem to twist off. It gets tighter in each direction (clockwise or counterclockwise).

Does anyone know what this "filler adapter" is, how it gets removed, or, if not, if it's something that can be re-threaded?


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post #2 of 29 (permalink) Old Apr 25th, 2008, 3:04 am Thread Starter
 
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Do you know what this "filler adapter" does?

Quote:
Does anyone know what the purpose of this "filler adapter" is?
Here is a diagram of the "filler adapter" and "grub screw" in the 1999 K1200RS right front rotor from the BMW Motorrad shop manual.

Since this aluminum chamber is stripped, I'd like to just replace it but I don't know if it's repairable as it doesn't seem to spin out. Am I doing something wrong?

Do you know what this "filler adapter" does and how to replace it?

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post #3 of 29 (permalink) Old Apr 25th, 2008, 3:12 am Thread Starter
 
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Quote:
Originally Posted by donnatello
Here is a diagram of the "filler adapter" and "grub screw" in the 1999 K1200RS right front rotor from the BMW Motorrad shop manual.
Notice the left caliper does not have the "filler adapter".

Q1: What does the "filler adapter" do?
Q2: How do we replace the filler adapter?
Q3: Why don't I have a "grub screw" (what does it do?)

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post #4 of 29 (permalink) Old Apr 25th, 2008, 7:22 am Thread Starter
 
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What does this "filler adapter" do; and is it a replaceable item

Quote:
Notice the left caliper does not have the "filler adapter".
Funny, I thought I'd see this "filler adapter" in the parts diagram, but I do not see it.

Does YOUR BMW K1200RS have this filler adapter only on the right caliper?


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post #5 of 29 (permalink) Old Apr 25th, 2008, 8:19 am
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could it be a speed bleeder? www.speedbleeders.com
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post #6 of 29 (permalink) Old Apr 25th, 2008, 8:24 am
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This gub screw assembly is also common on the LT and it is used by the factory to facilitate filling of the brake system (there is also one on the clutch bleed) . I stripped mine in 2000 and went crazy trying to find one. I actually drove to Houston because a dealer there said they had one- they didn't, all they had was a bleed screw.

It appeared that I had to replace the whole caliper.

Well, sitting in a coffee shop and lamenting, I was playing with the parts and noticed that the gub screw assembly and a bleed screw were the exact same threads. IT WORKED!!!

Just replace the gub screw assembly with a bleeder and start sleeping nights again.

-=grif=-
What was that middle thang?
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post #7 of 29 (permalink) Old Apr 25th, 2008, 10:31 am Thread Starter
 
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Does anyone else have a photo of their speed bleeder?

Quote:
it is used by the factory to facilitate filling of the brake system (there is also one on the clutch bleed). Just replace the grub screw assembly with a bleeder
Thanks ... this helps. But, Um. Er. ..ok...

It's still very confusing though because:
- It doesn't look anything like the speed bleeders on the Internet (see photo below)
- It is drawn clearly in the BMW Autorrad shop manual (but not explained)
- The manual shows a "grub screw" in the "filler adapter" but I don't see that in mine
- The "filler adapter" is not on the parts diagram (at least not on www.realoem.com)
- I tried unscrewing the "filler adapter" but it just tightened in both directions
(I was being gentle and did not force it, after all.)

The main questions becomes:
- Does it just unscrew out then?
- How can the shop manual show it but the parts diagram does not?

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post #8 of 29 (permalink) Old Apr 25th, 2008, 11:02 am Thread Starter
 
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Quote:
Originally Posted by zbiggboy
could it be a speed bleeder?
Hmmmm.... maybe but there are some weird circumstances ...

Examining the shop manual, and pressing a screwdriver in the "filler adapter", it seems that there is a spring inside the filler adapter ... so maybe it is a "speed bleeder" of sorts.

That would explain why the brake fluid didn't spill out even with the bleeder valve removed. I guess I can ride the bike as it is (sans the bleeder valve) to the shop to get the parts (the grub screw is nowhere to be found). (What does "grub" mean anyway?)

I can't comprehend the instructions in the shop manual; my assumptions must be wrong.
Here are the instructdions for "Brake calipers with filler adapter".
  • Remove socket-head grub screw (1) from the filler adapter
  • Connect the brake bleeding device to bleed screw (2)
  • Screw the bleed screw all the way into the filler adapter (valve in filler adapter closed)
  • Open the bleed screw by half a turn (to open the valve)
  • During the process of changing the brake fluid, make sure that the return bore is always below the level of the brake fluid, as otherwise air will be drawn into the brake system. Bleed the system again if this happens.
  • Draw off brake fluid until it emerges clear and free from air bubbles
  • During the vacuum extraction process, it might not be possible to tell whether there is brake fluid in the hose of the brake bleeding device when it is free of bubbles. You should then respond by bleeding the system manually.
  • Remove the bleed screw
  • Disconnect the brake bleeding device from the bleed screw
  • Install socket-head grub screw (1) in filler adapter and tighten
  • The motorcycle is not permitted on the road without the grub screw in place and secure in the filler adapter
  • Grub screw in filler adapter torque = 10NM (i.e., 7 ft lbs)

Notice the wierdness.
- Where is this so-called "socket-head grub screw" (it's nowhere to be seen)
- What is a "grub screw" anyway (a grub is a bug in American English)
- Can, in an emergency, the bike be ridden without anything screwed in?

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post #9 of 29 (permalink) Old Apr 25th, 2008, 11:04 am
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You DO NOT want to use a speed bleeder. Just use the bleeder that was on the gub screw assembly.

-=grif=-
What was that middle thang?
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post #10 of 29 (permalink) Old Apr 25th, 2008, 11:07 am
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Quote:
Originally Posted by donnatello
The main questions becomes:
- Does it just unscrew out then?
- How can the shop manual show it but the parts diagram does not?
Yes it unscrews, lefty loosey. If it doesn't come out easily, you have to JUDICIOUSLY use some heat to break up the loctite.

I don't know why the parts diagram doesn't show it. Twilight Zone?

-=grif=-
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