Is there any disadvantage over having a mini with a Duel circuit master cylinder over the single circuit, cause i have a brand new single circuit cylinder, but the tandem one works fine aswell although its is getting old, i am putting cooper s disc brakes and also wanted to know if the duel circuit cylinder will work ok.

also what is needed to convert from duel to single apart from the master cylinder

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77 Leyland Clubman
1293cc, LCB extractors, pulsar dizzy (recurved), cooper s disc brakes, 40DCOE Weber

Dual circuit were fitted because of ADR design rules and the fact that itstill gave you brakes should a circuitfail. Minis are good at that.

Having said tha, single circuit brakes were around for a long time before the dual circuit and legendary mini heroes like Paddy Hopkirk, Rauno Aalternen and Bob Holden had complete trust in the single circuit brakes.

A down side of the dual circuit is that its fairly difficult to fit a booster on just one circuit and have even hard braking.

Disk brakes use different sized wheel cylinders on the rears and probably have a different pressure limiting valve. Others on here should be able to give you specific change over information for wheel cylinders etc.

I simply bolted a set of 7.5 inch discs on my mini and made no other changes and found the brakes were very good. I do not run a booster but i am not super sprinting or caning the car.

We've got 2 Minis with S front discs, one has a Cooper S M/C and the other the late Clubby tandem one.
Brakes work the same on both, but I needed to fit Cooper S rear wheel cylinders (5/8" dia) to both cars, to stop the rears locking during panic braking..

If you must have a servo (booster), just fit it to the front circuit.

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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 know the good Dr posted this before

Where do you get rebuild kits for these?
Are the plastic reservoirs still available?
What does the s/w on the side do, are they still available?

Blue

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Keep shiny side up

Clubby tandem M/C rebuild kit is `PBR? K7800X, I got from B&R Brakes but any brake shop can get. Made in Oz. Price is around $35.
Unsure about plastic reservoir availability, or the switch.
Switch is for brake fault dash lamp I think... ours is not hooked up (it's in a roundnose).

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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

Blue

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Keep shiny side up