Author Topic: Leaking rear master cylinder  (Read 421 times)

Offline brother dave

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Leaking rear master cylinder
« on: January 26, 2022, 08:07:49 AM »
The subject bike is a 2007 California Vintage with 56K miles.  I have owned for just under a year and have been addressing a number of minor issues.  The leak was first observed yesterday and I do not believe there was any issue the last time I rode the bike (probably December).  Leak is at the very top of the master, coming out from around the top of the brass nut that attaches the rear brake lamp switch (you might be able to see some fluid around the blue plastic on top of the brass nut).   Anyone have a similar problem and know if the part is repairable or do I just need to hunt down a new switch?
Cheers,
Dave

2007 California Vintage (left the nest)
2018 V7 III Special
2021 V85 Centenario

Online John A

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Re: Leaking rear master cylinder
« Reply #1 on: January 26, 2022, 09:32:33 AM »
It’s the switch, just replace it. There is not a repair other than replacing it.
John
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Offline brother dave

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Re: Leaking rear master cylinder
« Reply #2 on: January 26, 2022, 09:43:50 AM »
It’s the switch, just replace it. There is not a repair other than replacing it.
John,
Thanks.  Searching for a suitable replacement now.  Guess I better make sure I have some tubing and buy some new brake fluid as well.  Was actually thinking about replacing the brake fluid recently so now is the time...
Cheers,
Dave
2007 California Vintage (left the nest)
2018 V7 III Special
2021 V85 Centenario

Offline pete mcgee

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Re: Leaking rear master cylinder
« Reply #3 on: January 28, 2022, 11:40:56 PM »
Replace the 2 crush washers when you change the switch.
Pete (no not the Bungendore one)


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Re: Leaking rear master cylinder
« Reply #3 on: January 28, 2022, 11:40:56 PM »

Offline brother dave

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Re: Leaking rear master cylinder
« Reply #4 on: January 30, 2022, 07:50:48 AM »
Replace the 2 crush washers when you change the switch.
Pete
Will do.  Was able to source a compatible switch online for $10 on Amazon.  Seems to fit perfectly.  Now just need to bleed the integrated brakes.  Sounds like a good project for a cold Sunday afternoon :)
Thanks
Dave
2007 California Vintage (left the nest)
2018 V7 III Special
2021 V85 Centenario

 

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