Hello all,
Wondering if anyone can tell me if the brake and clutch master cyliner are interchangable? Or is there a mod required?
Thanks.

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WHAT THE!!!

Yeah, well.... it depends..

Most Minis have a 0.700" bore brake master cylinder (except early 850, and 998 Cooper)

Most Minis have a 0.750" clutch master cylinder.

If using `tin tank' MCs the flanges are different orientation between clutch and brake.

Brake MCs have a slow-return restrictor valve in top, clutch ones don't.

If using plastic tank cylinders (Lockheed/PBR) the 0.700 brake will work as a clutch one, but you will get less clutch stroke to release the plate, clutch will tend to drag.

So.... whaddya wanna do??

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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.

MOST of the ones i recondition seem to be the wrong bore for the application, and do/dont have valves where they should/shouldn'tt... I have a feeling my clutch one is incorrect....

G

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--Insert legal disclaimer here--

Hey thanks guys
just doing a restoration and have these two master cylinders, they both fit on either side, wern't sure which went were.
I will just have to pull them apart and measure them up.
Appreciate the info thanks.

Den

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WHAT THE!!!

On the Lockheed/PBR plastic tank ones, the bore is often marked on the body.

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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.