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 Brake Fluid Leak 
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 248
Location: 15340 Mourjou France
Post Re: Brake Fluid Leak
Thanks everyone. I'll give it a try in daylight tomorrow.

I rather think that we are at cross purposes using the word "bayonet". To me it's those two pins on the side of a light-bulb.

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Dennis usually in the Cantal

1964 HY 72 (Type H, campervan) - LHD
1969 AZU 250 (formerly French Post Office van) - LHD
1982 Red Special - RHD
1983 Burgundy/Black Charleston - RHD
2017 Skoda Octavia Estate 1.4 DSG - LHD


March 13th, 2019, 9:23 pm
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
Posts: 1994
Location: South-Limburg
Post Re: Brake Fluid Leak
maybe better visible here, no bayonet, just a rim that clicks in the rubber seals.


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March 14th, 2019, 9:08 am
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Firing on two.
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Joined: August 8th, 2012, 11:00 am
Posts: 480
Location: Korpilahti, Finland
Post Re: Brake Fluid Leak
From my experience, they tend to leak when cold, even with quite new seals. Never bothered to worry about, only check the amount of LHM more often on winters...

And another thing, they seems to leak more when not driving...


March 14th, 2019, 11:11 am
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 248
Location: 15340 Mourjou France
Post Re: Brake Fluid Leak
Thanks very much everyone. I pulled it out, carefully but firmly, if that makes sense.

The seals look OK but the reservoir has a crack, which was in a place where I couldn't see it until I took it off and started cleaning away the dirt.

I've ordered a new reservoir and new seals.

And no, that's not what I'd call a bayonet fitting (pins and a twist). It just pushes on .... and off. But then, actual bayonets stopped having bayonet fittings a long time ago.

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Dennis usually in the Cantal

1964 HY 72 (Type H, campervan) - LHD
1969 AZU 250 (formerly French Post Office van) - LHD
1982 Red Special - RHD
1983 Burgundy/Black Charleston - RHD
2017 Skoda Octavia Estate 1.4 DSG - LHD


March 14th, 2019, 12:29 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Brake Fluid Leak
No pins on these bayonet fittings, nor on such fittings so described by many other manufacturers... ;)

https://www.sipuk.co.uk/connectors-coup ... ptors.html

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March 14th, 2019, 4:03 pm
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 248
Location: 15340 Mourjou France
Post Re: Brake Fluid Leak
Other suppliers seem to have different names for those types of air line connectors, Ken:

https://uk.rs-online.com/web/c/pneumatics-hydraulics-power-transmission/pneumatic-adaptors-fittings-couplings/pneumatic-quick-connect-couplings/

And then, of course, Wikipedia speaks (twice):

https://en.m.wikipedia.org/wiki/Bayonet_mount

https://en.wikipedia.org/wiki/Bayonet_mount

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Dennis usually in the Cantal

1964 HY 72 (Type H, campervan) - LHD
1969 AZU 250 (formerly French Post Office van) - LHD
1982 Red Special - RHD
1983 Burgundy/Black Charleston - RHD
2017 Skoda Octavia Estate 1.4 DSG - LHD


March 15th, 2019, 12:25 am
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Firing on two.

Joined: April 20th, 2017, 10:55 pm
Posts: 107
Post Re: Brake Fluid Leak
'Bad' becomes good, 'wicked' becomes cool, 'cool' becomes great, now bayonet becomes push fit, and twist becomes tilt. Always been a push and twist action to me using pins into right angled slots or grooves.

Like fast cars - some things I don't want to keep up with.

Got the grumps this-morning.


March 15th, 2019, 11:24 am
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2CV Fan

Joined: October 30th, 2009, 10:00 am
Posts: 76
Location: Farrington Gurney, Nr Bristol
Post Re: Brake Fluid Leak
I have had the same problem and agree with the comments. Leaks more in the cold, also when not used for a few days (especially in the cold weather). I've replaced the seals but the level is still going down slowly. Didn't notice any cracks in the reservoir. I'm just wondering if I've got the reservoir fully home. Does it need quite a lot of pressure to get the rims of the reservoir to engage in the grooves in the seals?
Don


March 16th, 2019, 12:06 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Brake Fluid Leak
Don,
having carried out removal and refitting of master cylinder reservoirs on several hundred occasions during the last 35 years, this is what's worked for me.
( Click on the link for full text.)
In addition to using LHM as a lubricant, a light coating of grease on the seals and the reservoir spigots also helps to ensure an easy and leak-free installation... ;)
.
ImageDual master cylinder, bayonet fitting. by slcchassis, on Flickr

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March 16th, 2019, 1:01 pm
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Firing on two.

Joined: December 21st, 2014, 7:33 pm
Posts: 866
Location: Rhayader Mid Wales
Post Re: Brake Fluid Leak
Judging from the photo, it's not 'Grim up North' at all. :mrgreen:


March 16th, 2019, 1:43 pm
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