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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: 210
Location: 15340 Mourjou France
Post Brake Fluid Leak
I have a small but significant leak of LHM from the Red Spécial, and I am fairly sure that where it is going is between the plastic reservoir and the cast metal master cylinder.

The reservoir can be wobbled slightly on top of the cylinder, and when I do that there appears to be a very small bubble or two of LHM between the plastic and the metal. There's evidence of leakage on the body and the RH steering arm further down.

The wheel cylinders and disk mechanisms all look nice and dry.

Is there some kind of replaceable washer underneath the reservoir? Or something to tighten up?

I'm always a little nervous of attacking the braking system, but this definitely needs attention.

I'd really appreciate advice.

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Dennis usually in the Cantal

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


March 12th, 2019, 2:32 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 777
Location: Exeter, Devon
Post Re: Brake Fluid Leak
It could be, the reservoir is just not seated probably. My experience is they can be difficult.

Should you need seals, you can get them here. You require lhm seals for lhm. ;)

https://www.ecas2cvparts.co.uk/-c-38_46 ... 044b482f11

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


March 12th, 2019, 2:44 pm
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2CV Fan

Joined: April 20th, 2017, 10:55 pm
Posts: 97
Post Re: Brake Fluid Leak
Some advice here:
http://www.2cvgb.co.uk/forum/showthread ... post211585


March 12th, 2019, 4:34 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
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Location: Exeter, Devon
Post Re: Brake Fluid Leak
Derek :)

You have to be able to log in to see it. ;)

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


March 12th, 2019, 6:23 pm
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Firing on two.

Joined: December 21st, 2014, 7:33 pm
Posts: 594
Location: Rhayader Mid Wales
Post Re: Brake Fluid Leak
This is advice given to me by Ken Hanna when I had to replace the reservoir seals.

'standing on the offside of the car, take hold of the reservoir and push/twist it inwards, so 'clockwise' when viewed from the front.
That 'rolls' the bayonet fittings on its base out of their seals.
.
When refitting, smudge LHM over the seals and the prongs on the underside of the reservoir and push it straight down.'

Good luck and check to see that the Reservoir has no cracks, mine did!


March 12th, 2019, 8:35 pm
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2CV Fan

Joined: April 20th, 2017, 10:55 pm
Posts: 97
Post Re: Brake Fluid Leak
Thanks Roger - I was forgetting that!!


March 12th, 2019, 10:35 pm
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 210
Location: 15340 Mourjou France
Post Re: Brake Fluid Leak
Roger V wrote:
It could be, the reservoir is just not seated probably. My experience is they can be difficult.

Should you need seals, you can get them here. You require lhm seals for lhm. ;)

https://www.ecas2cvparts.co.uk/-c-38_46 ... 044b482f11


Would that be these two little things?
https://www.ecas2cvparts.co.uk/seal-under-reservoir-master-cylinder-57129-pair-notes-p-1233.html?WSid=fef1904c77a94d043dc683044b482f11

Does the master cylinder just push down onto them? I am not sure that there is really a bayonet fitting.

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Dennis usually in the Cantal

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


March 12th, 2019, 10:37 pm
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
Posts: 1169
Location: South-Limburg
Post Re: Brake Fluid Leak
It are those seals. The reservoir can be taken of the master cylinder by pushing it away sideways. Do it slowly and if it is still full hold some vessel under it. Normally it will pop out of the seals. Good luck.


March 12th, 2019, 11:16 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 777
Location: Exeter, Devon
Post Re: Brake Fluid Leak
Take a look at the reservoir also shown on the link I included and you can see the shape. Its not attached other than inserting it. It can require a robust approach to insert or remove. I would check it is seated properly in the first place. :)

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


March 12th, 2019, 11:29 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3638
Post Re: Brake Fluid Leak
Also worth checking that the seals are correctly seated into the master cylinder before inserting the reservoir's (non-quick disconnect) bayonet prongs.
Once again, lubrication with LHM will help to ensure a leakproof fit...
.
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March 13th, 2019, 1:54 am
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