Slim master cylinder

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Mark S Forster
(MK1 Performance Conversions)
Rev 2.10 (06.10.20)
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Location: Hampshire

Slim master cylinder

Post by 5portsrock »

Slim master cylinder. Seen them used on the early supercharged cars. It is nos. Inside is very clean. The outside has the usual tin tarnish, which can be cleaned up nicely with some patients and a toothbrush.£125 + postage (would think about £8 UK signed for)
Thanks for looking.
PS I'm near Portsmouth.
Brown stuff in the last pic is a wax.
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Re: Slim master cylinder

Post by rdcoulthard »

Nice item. Correct 5/8” size for 998 Cooper callipers, and will give much better braking on those cars than the more common 7/10” masters. These narrow ones were supplied to LHD European markets from 1967-69 with a transparent extension to visually check fluid level.
My Minis:
1969 Austin Cooper Mk II
1962 Austin Cooper
1960 Morris 850
1960 Morris 850 Traveller
Dr S
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Re: Slim master cylinder

Post by Dr S »

Is there a difference between the clutch and brake masters? Could be interested - I’m part way though fitting a charger
I've got a 69 Mini with a 1046, Cooper Head and a four on the floor.
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Re: Slim master cylinder

Post by 5portsrock »

Really no idea. Perhaps slight difference in bore size?
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Re: Slim master cylinder

Post by Charlynsane »

Very nice item

I have one as well but I'm interested by yours

As for me the best solution is to bore it to 11/16 like others brake master cylinders
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Re: Slim master cylinder

Post by GDMk238 »

Master cylinder still available? Interested if it is.
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Re: Slim master cylinder

Post by 5portsrock »

Still available.
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Re: Slim master cylinder

Post by andy1071 »

Dr. S -the 'only' difference between brake and clutch master cylinders (ignoring an y push-rod difference) is the non-return valve feature in the brake.
-This can be removed if you want to use it for the clutch -just take out the curved brass strip in the nylon spring locator at the bottom of the bore.

-Or add one from another cylinder to convert a clutch to brake cylinder.

Charlynsane: you can only bore out the cylinder to a larger size if you sleeve it as well. -You will machine away the small cut-off port (less than 1mm diameter hole).
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