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Best master cylinder for 4 pot brakes? 0.70? 0.75?

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MattE

Post subject:

Posted: Fri Oct 09, 2009 7:25 am

848cc

Joined: Mon Jan 12, 2009 11:22 pm
Posts: 389
Location: Flynn, ACT

Does anyone know if its possible to convert a clutch master (0.75") to brake? I imagine the difference is in drillings in either the bore or piston.
Alternatively, would it be hard to find a 0.75" brake master? What cars did these come on?
If anyone has one, I'd be interested!
Thanks
Matt

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'68 Deluxe w/Metro engine

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GT mowog

Post subject:

Posted: Fri Oct 09, 2009 6:10 pm

Mods rock!

Joined: Fri Oct 03, 2008 9:02 pm
Posts: 5079

The Clutch M/C can be converted, you just need the valve from a brake M/C, some of the over kits include it.

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drmini in aust

Post subject:

Posted: Fri Oct 09, 2009 6:47 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39757
Location: near Baulkham Hills, NSW

MattE wrote:

0.75" brake master cylinder was used originally on Morris 850.
Also on 997 Cooper I think (with a hydraulic intensifier). But not the 998 Cooper (they had a 0.625" one and no intensifier).

I would use a plastic tank Oz Clubby 0.75" clutch one, and fit the restrictor valve in the top.

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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. :mrgreen:

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MattE

Post subject:

Posted: Sat Oct 10, 2009 6:25 am

848cc

Joined: Mon Jan 12, 2009 11:22 pm
Posts: 389
Location: Flynn, ACT

I see that CM have a 0.75" brake master cylinder kit "to suit Australian type plastic tank brake master cylinder as fitted to Australian Minis and Mokes from 1969 to 1976".

Is the valve in question the shiny part in the bottom right of the pic? If so, I think I'm in business - but gee, kit prices ain't what they used to be!

http://classicmotoring.net.au/cmos/index.php?main_page=product_info&cPath=20_142&products_id=758

Thanks again.
Matt

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GT mowog

Post subject:

Posted: Sat Oct 10, 2009 5:52 pm

Mods rock!

Joined: Fri Oct 03, 2008 9:02 pm
Posts: 5079

Doesn't appear to, sorry - but the price ($40) is out of this world !!! I recently paid about $12 for a similar kitb !!

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MattE

Post subject:

Posted: Sat Oct 10, 2009 8:44 pm

848cc

Joined: Mon Jan 12, 2009 11:22 pm
Posts: 389
Location: Flynn, ACT

$12!? Where was that from? And was it a "reputable" brand?

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'68 Deluxe w/Metro engine

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GT mowog

Post subject:

Posted: Sun Oct 11, 2009 5:58 pm

Mods rock!

Joined: Fri Oct 03, 2008 9:02 pm
Posts: 5079

Local Brake Specialist. It may have been a trade price, but it shouldn't be more than $18.00 at most. I think it was a PBR but in any event, it was a known brand.

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MattE

Post subject:

Posted: Sun Oct 25, 2009 8:44 pm

848cc

Joined: Mon Jan 12, 2009 11:22 pm
Posts: 389
Location: Flynn, ACT

Well I've found a 0.75" cylinder, and ordered a kit. Hope to get it sleeved soon, but in the meantime, I've found these two 0.75" pistons.
Any ideas on which one to use, or why there are these two variations?
One is sllightly longer and has a much, much deeper land for the push rod to live in.
Thanks for any tips.
Matt

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