Master cylinder reservoir

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Caprifan Rob
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Master cylinder reservoir

Post by Caprifan Rob » Wed Aug 12, 2020 10:09 pm

Had a refurbished Brake master cylinder fitted 2 years ago and it’s recently developed a leak on both reservoir seals. Have replaced seals & reservoir, does anyone know if this is how it should look as there’s a small gap between reservoir & seal. No amount of pressure seems to close the gap, just checking if this is normal as don’t want to damage it.
Thanks, Rob
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pbar
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Re: Master cylinder reservoir

Post by pbar » Thu Aug 13, 2020 6:05 am

Is that the 'correct' reservoir Rob, I thought the 2.8 one should look like this, for sale at the Capri Club -

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Caprifan Rob
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Re: Master cylinder reservoir

Post by Caprifan Rob » Thu Aug 13, 2020 6:43 am

pbar wrote:
Thu Aug 13, 2020 6:05 am
Is that the 'correct' reservoir Rob, I thought the 2.8 one should look like this, for sale at the Capri Club -
Hi Paul, yes all correct, bought it from Martin at Caprigear. May be the angle I took picture. Wanted to get the gap in view.

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pbar
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Re: Master cylinder reservoir

Post by pbar » Thu Aug 13, 2020 7:15 am

Okey doke Rob, yes I did think it may just be the angle, a bit like one of those 'what is it' pics, taken at unusual close up angles :) Hope you get it sorted soon.

STEVEW
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Re: Master cylinder reservoir

Post by STEVEW » Thu Aug 13, 2020 7:28 am

Hi Rob

I’ve just checked our car (2.3S): the seals are flush. Although our master cylinder is not quite the same as yours I would think that the seals should sit without a gap.
Having said that, could it be you have an air lock in the system preventing full insertion of the reservoir?
My suggestion: lightly lubricate the seals with brake fluid and “crack” the brake lines open around the differential valve and try again.

All the best

Edited to add: I've just seen a seal kit advertised on Ebay which includes a sachet of, "Frentec Braking" red rubber grease so I guess this is the right stuff or something similar, to lubricate the seals before fitting.

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Re: Master cylinder reservoir

Post by Mc Tool » Thu Aug 13, 2020 9:21 am

That set up looks fine to me . The thing seals on the spigots on the bottom of the resiviour .....not on the flat surfaces of the rubber seal and the bottom of the resiviour. :)
you gotta make the most :cheers: :cigar: :burnout: out of your 20's, 30's, and 40's coz when you hit 50 the "engine check" light comes on. :?

Caprifan Rob
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Re: Master cylinder reservoir

Post by Caprifan Rob » Thu Aug 13, 2020 1:56 pm

pbar wrote:
Thu Aug 13, 2020 7:15 am
Hope you get it sorted soon.
Cheers Paul, looks like all is ok.
STEVEW wrote:
Thu Aug 13, 2020 7:28 am
I’ve just checked our car (2.3S): the seals are flush.
My suggestion: lightly lubricate the seals with brake fluid
Thanks for checking Steve, I know different engines have different cylinders, some flush reservoirs & some not :headscratch: . Did use brake fluid to help fitting & that's as close as I could get it, no leak now so hopefully sorted.
Mc Tool wrote:
Thu Aug 13, 2020 9:21 am
That set up looks fine to me . The thing seals on the spigots on the bottom of the resiviour .....not on the flat surfaces of the rubber seal and the bottom of the resiviour. :)
Thought as much, thanks Hamish. Checked recess in seal before fitting, just wanted to check before driving as brakes can be quite handy :cheers:

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Re: Master cylinder reservoir

Post by STEVEW » Thu Aug 13, 2020 5:17 pm

Thanks for the feedback Rob.
I'm pleased you seem to be sorted.

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Re: Master cylinder reservoir

Post by Peter-S » Thu Aug 13, 2020 5:40 pm

Mc Tool wrote:
Thu Aug 13, 2020 9:21 am
That set up looks fine to me . The thing seals on the spigots on the bottom of the resiviour .....not on the flat surfaces of the rubber seal and the bottom of the resiviour. :)
Thought as much, thanks Hamish. Checked recess in seal before fitting, just wanted to check before driving as brakes can be quite handy :cheers:
[/quote]

Hamish doesn't really use brakes :lol:
ImageBanner by Peter Smith, on Flickr

Caprifan Rob
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Re: Master cylinder reservoir

Post by Caprifan Rob » Thu Aug 13, 2020 6:54 pm

Peter-S wrote:
Thu Aug 13, 2020 5:40 pm
Hamish doesn't really use brakes :lol:
I know Peter, I've seen the pictures ;)

Good luck with getting it sorted Hamish.

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Re: Master cylinder reservoir

Post by Mc Tool » Fri Aug 14, 2020 12:12 am

Peter-S wrote:
Thu Aug 13, 2020 5:40 pm
Hamish doesn't really use brakes :lol:
I was waiting for that :xd:
you gotta make the most :cheers: :cigar: :burnout: out of your 20's, 30's, and 40's coz when you hit 50 the "engine check" light comes on. :?

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