So which is which?


Also when mounted to bulkhead which resorvoir is at the front?
My original mini k is like this.



Brake is .750 bore and clutch is .700 bore.
But can you tell externally?


Thanks.

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Now with 2 extra ports!

I think they are mounted round the right way... but.
They are in the wrong place, the brake MC should be 0.70" and clutch 0.75".
0.70" clutch doesn't move enough fluid for reliable operation.
0.75" brake takes too much pedal effort.

850 with single LS brakes had a 0.75" brake MC, all single line Oz Minis since 1965 have used a 0.70" brake MC.
(998 Cooper had a 0.625" one).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Doc.
So in the top pic which is the brake and which is clutch?


How to tell without knowing what bore size is inside?

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Lift the rubber boots off from the bottom of the master cylinders and measure the bores directly.

You can remove the circlip retaining the inner gubbins and compare them directly.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Yep , very good idea!

Cheers.

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Now with 2 extra ports!

Get a piece of wire about the size of a choke cable, and put it down the
top hole where the pipe will be connected, if it is brake it will stop within about
an inch or so if the wire can put pushed further down
it will be the clutch

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" A Hundred Years From Now It will not Matter what my Bank Acount Was,
The Sort Of House I Lived in, Or The Kind Of Car I drove ... But The World May Be A Better Place
Because I was Once Important In The Life Of A Child"

Thanks John. I'll try that method in the morning.


Cheers.

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Now with 2 extra ports!

I remember when I pulled my GT ones apart (both were Lockheed branded though) one had 7" marked and the other where the 7" would have been it was ground off (due to it being the .75 size)

Don't know about the PBR ones....

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Yes, some of this type MC have the bore marked on the outside and some do not. I can't remember if Lockheed or PBR.

What John said re putting a bit of wire in, that will tell you if there is a restrictor valve in there (used for brakes, not clutch). But this valve can be put into either size cylinder by anybody...

Some Clubbies (I think?) came out with a 0.70" clutch, but as I said they are marginal for clutch throw once things start to wear. A 0.75" one works much better.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I am sorry If I did not understand Your question, I thought You wanted to Know
Which master Cylinder is set up for brake, and which one was for clutch so that You fit
them in the correct position I did not read it that You wanted to Know the bore size,

now days You cannot take the markings on the outside .7 or .75
as being gospel I have seen many a .7 converted to a .75
by sleeving them and the same goes the other way around

Also looking at the Photo with the master cylinders fitted.
and the Doc may be better able to advise You, But it is my opinion
that the pipes fitted in that photo are incorrect as in not the correct bends
in the correct places
I am however not saying they will not work as they are.

_________________
" A Hundred Years From Now It will not Matter what my Bank Acount Was,
The Sort Of House I Lived in, Or The Kind Of Car I drove ... But The World May Be A Better Place
Because I was Once Important In The Life Of A Child"

Hi Super Cooper
I think the brake reservoir is closest to the bulk head
and the clutch to the front
your clutch pipe will have a 90 deg side step and the brake pipe will
be 45 deg in the opposite direction
I will try to post a picture for you

Mark

Hope this help

Thanks Slacko! Went thru some tme mags last night too and most pics seem to be brake reservoir closest to bulkhead.
Have not yet tried the wire method as yet. Just got home from work.
Will hopefully get some time when the monsters go to bed.

Thanks all for the posts.

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Now with 2 extra ports!

Thanks John. Now that you point it out those pipes do look wrong. I have not touched that car (mini k)
But someone has. As Slacko also posted the pipes sought of reveal the orientation.
Cheers.

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Now with 2 extra ports!

In this case the pbr mc is the brake because it has the valve in it.

The Lockheed mc is the clutch because you can push wire further down and no valve.

Thanks John.

Thanks Slacko for sorting out which way around they go.

Now need to is tall in the S and swap them around in the K.

Cheers.

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Now with 2 extra ports!