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 Master Cylinder Reservoir Seals 
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
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Location: Reading, Berks UK
Post Master Cylinder Reservoir Seals
Friends, I'm here picking your brains again.

My master cylinder is dripping fluid. Possibly since I had to change the steering column and there was a lump hammer involved. If I wiggle the reservoir down a bit or improves, but doesn't completely stop, still a tiny bit of moisture.

I've ordered the seals from Ecas. Any instructions to fit these or is it obvious?

Thanks!


February 7th, 2022, 9:16 pm
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
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Location: South-Limburg
Post Re: Master Cylinder Reservoir Seals
Just push the reservoir sideways till it comes out. Change the seals and wriggle it in with a bit of force. Empty it as far as possible before.. ;-)


February 7th, 2022, 10:07 pm
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Joined: January 1st, 2009, 7:37 pm
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Post Re: Master Cylinder Reservoir Seals
And make sure the faces either side of the new seal are spotlessly clean and smooth :D

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February 7th, 2022, 10:20 pm
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Joined: March 21st, 2013, 12:04 am
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Location: Exeter, Devon
Post Re: Master Cylinder Reservoir Seals
add a little LHM to lubricate when adding the seals and you may need to be a little robust when pushing the reservoir back in.

You may actually find that is the issue you have with the old seal. You do need to be robust when pushing it back in.

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


February 7th, 2022, 11:06 pm
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Joined: June 22nd, 2014, 8:09 pm
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Post Re: Master Cylinder Reservoir Seals
Awesome. Thanks guys!


February 8th, 2022, 12:38 am
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
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Location: Reading, Berks UK
Post Re: Master Cylinder Reservoir Seals
Quick question please guys. I won't need to bleed the brakes after changing these seals will I?
I haven't got around to it yet, it's dripping quite a lot so I should. I almost forgot but the little red light popped on and reminded me. Oops!


July 7th, 2022, 12:13 am
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Joined: March 21st, 2013, 12:04 am
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Post Re: Master Cylinder Reservoir Seals
No, you should not need to bleed, as any air will just rise in the reservoir.

Though I strongly recommend you try a more robust approach with original seals first. :)

As you can see from the lip on the reservoir, and the shape of the new seals you have, it needs to be pushed well in to stop the seals distorting.

A can of brake/clutch cleaner will tidy it afterwards. :)


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


July 7th, 2022, 9:06 am
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Joined: June 22nd, 2014, 8:09 pm
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Location: Reading, Berks UK
Post Re: Master Cylinder Reservoir Seals
Thank you Roger. I've been pushing it in pretty strongly, but it's worth another go. Nothing to lose is there. Apart from a small amount of fluid!

The picture is really helpful too, thanks!

Yeah I thought no bleeding needed but thought I'd check.


July 7th, 2022, 2:42 pm
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Joined: March 21st, 2013, 12:04 am
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Post Re: Master Cylinder Reservoir Seals
just do it :)

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


July 7th, 2022, 11:13 pm
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
Posts: 1179
Location: Reading, Berks UK
Post Re: Master Cylinder Reservoir Seals
I lost the seals I bought, and took so long to get some more, I only just did this yesterday.

Super easy of course, and all seemed well until I noticed a tiny bit of fluid still - there was a hard to see crack in the reservoir itself. Should be OK for now as its only just a bit below the maximum mark on the reservoir.
I think the seals were leaking too so I'm glad I changed those, and have ordered a new reservoir. Thank you for the help.


November 11th, 2022, 8:12 pm
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