Author Topic: Fixed leaky front master cylinder  (Read 3664 times)

Offline BrickMW

  • ^ Proficient Motobricker
  • Posts: 126
Fixed leaky front master cylinder
« on: June 25, 2017, 09:27:11 PM »
So I pulled my front cylinder back off today and decided to try fitting an oring somehow to stop the hemmorage of fluid that had resulted from my removing too much material yesterday when I ground out the bore to remove a pretty nasty layer of corrosion and get down past a couple of fairly deep pits.

Turns out the brick fairies were on my side today.. a 2 cent common oring from a Harbor Freight assortment kit did the trick! Had I expected any of this to work I would have taken better pictures. The size I used is 1/2" OD x 3/8" ID x 1/16" section. You can see it wedges nicely on the inside rim of the original seal.

I will continue to look for a replacement / backup.. but at least the yeeehaaa has resumed. [emoji106]

Last pic shows some of the snot I blew out of my calipers during the refresh.

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  • Huntsville, AL
  • 1986 K75c
Luft & Jager... My two favorite Meister's :bmwsmile

Offline tagaz

  • Curious
  • Posts: 6
Re: Fixed leaky front master cylinder
« Reply #1 on: June 25, 2017, 11:59:53 PM »
good job
great thinking to come up with a remedy for an unusual problem
unusual in that it was done not happened

  • Kingman, AZ USA
  • 1985 K 100 RT

Offline Laitch

  • Faster than a speeding pullet
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  • ^ Quintessential Motobricker
  • Posts: 10120
Re: Fixed leaky front master cylinder
« Reply #2 on: June 26, 2017, 08:06:21 AM »
. . .a 2 cent common oring from a Harbor Freight assortment kit did the trick! Had I expected any of this to work I would have taken better pictures. The size I used is 1/2" OD x 3/8" ID x 1/16" section. You can see it wedges nicely on the inside rim of the original seal.
Thanks for posting this remedy—temporary or not—under a specific title. I suggest you also post this remedy—or link to it—in your WTB K75 / 2V K100 Master Cylinder thread because the problem was discussed there. That might help readers of that thread by providing information. You could still affirm your offer to buy a spare master cylinder.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
I wept because I had no radials until I met a man who had no splines.
https://tinyurl.com/RillRider

Offline Chaos

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  • Mars needs women!
Re: Fixed leaky front master cylinder
« Reply #3 on: June 26, 2017, 09:20:58 AM »
Excellent!  Somewhere back in the archives here there is a thread on the good, the bad, and the ugly from Harbor Freight.  I have that o-ring set and it has been a life saver several times. 
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

  • Faster than a speeding pullet
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Re: Fixed leaky front master cylinder
« Reply #4 on: June 26, 2017, 05:40:38 PM »
Somewhere back in the archives here there is a thread on the good, the bad, and the ugly from Harbor Freight.
http://www.motobrick.com/index.php?topic=1799.0
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
I wept because I had no radials until I met a man who had no splines.
https://tinyurl.com/RillRider

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