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old*vine
Samba Member
Joined: July 12, 2013
Posts: 4
Location: Arizona
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 Posted: Thu Sep 02, 2021 10:52 am Post subject: replace grommet in master cylinder |
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I'm looking for advice on how to replace the grommet on the master brake cylinder. Brake fluid is seeping around the top grommet where the gravity feed filler line enters the master cylinder. I have a new German origin grommet from Jbugs part Code: 113611817.
I installed a new German origin (single port) master cylinder. Put in a new grommet, with difficulty, before installing the master cylinder. I'm surprised that grommet is leaking. Maybe that grommet is an after market or damaged when I inserted it. I can move the grommet up and down so it seems loose. Now the master cylinder is installed, I'd like to replace the grommet.
I think I can 'dig' the grommet out. But how to insert the new grommet?
The car is 1964 Karmann Ghia. Thanks for any advice. |
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 36224
Location: Conejo Valley, CA
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| Posted: Thu Sep 02, 2021 4:08 pm Post subject: Re: replace grommet in master cylinder |
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Some masters require a metal washer under that rubber stopper. I'm not sure which, but if it was missing the extra space might allow leaks.
This one is a Bug single master:
Type 3 dual:
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old*vine
Samba Member
Joined: July 12, 2013
Posts: 4
Location: Arizona
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| Posted: Fri Sep 03, 2021 6:12 am Post subject: Re: replace grommet in master cylinder |
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Thank you for so much detail of master cylinders.
In my case, the master cylinder does not show a requirement for a spacer washer. But I will recheck. My main concern is how to insert a new grommet. With the left front wheel removed, the master cylinder is assessable. The grommet is a tight fit into the gravity feed hole. I don't want to damage the rubber. |
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rcooled
Samba Member
Joined: September 20, 2008
Posts: 2815
Location: Santa Cruz, CA
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| Posted: Fri Sep 03, 2021 11:20 am Post subject: Re: replace grommet in master cylinder |
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| old*vine wrote: |
| My main concern is how to insert a new grommet. |
You might try using a large "C" clamp as a press in order to squeeze the grommet into place. A socket about the same diameter as the hole in the master cylinder placed between the grommet and clamp will help apply the force right where needed. Lubricate the grommet with brake fluid to reduce friction.
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| With the left front wheel removed, the master cylinder is accessible. |
Removing the gas tank will give you the best access to the master cylinder. It's only 4 bolts and takes but a few minutes. Siphon out most of the gas first to make the tank easier to handle.
_________________
'63 Ragtop (current)
'65 Ghia coupe (totaled)
'67 Ghia convertible (current)
'69.5 Ghia convertible and
'62, '63, '65, '69 Bugs (all long gone) |
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old*vine
Samba Member
Joined: July 12, 2013
Posts: 4
Location: Arizona
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| Posted: Fri Sep 03, 2021 11:32 am Post subject: Re: replace grommet in master cylinder |
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| Thanks for those thoughts. |
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Zundfolge1432
Samba Member
Joined: June 13, 2004
Posts: 12584
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| Posted: Fri Sep 03, 2021 1:04 pm Post subject: Re: replace grommet in master cylinder |
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| Not mentioned or maybe it was but I’d lube the new grommet with brake fluid and it will go in easier.😀 |
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jcordill
Samba Member
Joined: April 10, 2021
Posts: 8
Location: Kansas
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| Posted: Tue Oct 04, 2022 2:38 pm Post subject: Re: replace grommet in master cylinder |
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| Hey Old Vine did you solve your leak? I have the same problem. Was wondering if you added the washer and if it worked. |
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VWLady
Crazy VW Lady
Joined: March 13, 2004
Posts: 3865
Location: Twin Cities, MN
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| Posted: Thu Mar 20, 2025 2:05 pm Post subject: Re: replace grommet in master cylinder |
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Old post but I recently had a similar problem. Turns out the metal line from the reservoir that goes into the grommet was pushed in TOO FAR. The grommet has an area just past the entrance where the bubbled end of the metal line sits.
Push the line too far in and it will leak. Pull it back out until the bubbled end sits in the groove and it seals. |
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