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Old 08-23-2014, 02:31 PM   #1
airhead78 OP
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Where is the return hole

In the under tank master cylinder?

I must be blind. Trying to solve a ATE brake dragging problem starting with the easier steps first. Several threads mention the hole but could not find one that said where it is. Old age must be creeping...

TIA

Eduardo.
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Old 08-23-2014, 03:15 PM   #2
ozmoses
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This is a family themed place here!

If you can't see it, it's probably clogged.

MAXBMW does have the o-rings.
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Old 08-23-2014, 07:09 PM   #3
crazydrummerdude
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Quote:
Originally Posted by ozmoses View Post
MAXBMW does have the o-rings.
For purchase individually; not included in a master cylinder rebuild kit.

How "convenient."
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Old 08-23-2014, 07:16 PM   #4
ME 109
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Quote:
Originally Posted by crazydrummerdude View Post
For purchase individually; not included in a master cylinder rebuild kit.

How "convenient."
All part of the 'batteries not included' clause.
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Old 08-23-2014, 10:07 PM   #5
Wirespokes
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That's pretty funny - you guys going off topic and not answering his question.

There are two holes visible in the bottom of the reservoir - a large one and then maybe a 1/4" back, is a much smaller one. It might be the size of a small sewing needle.
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Old 08-23-2014, 10:59 PM   #6
Big Bamboo
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Yes, two holes; one in front the other, and you don't want to be working the lever while you're poking something in there to clean it. You'll damage the seal. I like to use dem bamboo kabab skewers; they don't break off like a toothpick do, an don't damage the bore like metal can.
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Old 08-24-2014, 08:55 AM   #7
crazydrummerdude
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Here's a quote from a different thread that shows both holes:

Quote:
Originally Posted by Brun View Post
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Old 08-25-2014, 09:45 PM   #8
airhead78 OP
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Thank you!

Now to go looking for it.... I will bring the magnifying glass
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Old 08-25-2014, 09:55 PM   #9
Big Bamboo
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Is the MC still on the bike? Is there any residue in the bottom of the bowl? You want to remove that, not pack it down the hole. The hole you are looking for is about the diameter of a bristle on a toothbrush. Visible to the naked eye, if it's clear, but easy to plug, too...
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Old 08-26-2014, 10:46 PM   #10
airhead78 OP
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Yes. Thanks for the tip.

Quote:
Originally Posted by Big Bamboo View Post
Is the MC still on the bike? Is there any residue in the bottom of the bowl? You want to remove that, not pack it down the hole. The hole you are looking for is about the diameter of a bristle on a toothbrush. Visible to the naked eye, if it's clear, but easy to plug, too...
Still on the bike. Will check for the crud that seemed to be there last I looked.
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