Hi,
I want to upgrade my mini brakes to a duel circuit system.
I have disks on the front with drums on the rear.
I have heard that a Mazda master cylinder will do the job.
Anyone have details on which cylinder to use and any modifications required?
Do you still need the pressure reducing valve on the rear sub frame?

The late clubbies used a dual circuit master cylinder. You would be well advised to use one of those rather than trying to modify and fit a mazda component. That way you are covered should you ever be involved in an accident and your car is examined and found to have non standard components that have not been engineer approved.

I am aware that with a disc / drum setup you will need to fit Cooper S rear wheel cylinders (which have a smaller diameter bore) to prevent rear wheel lock up under emergency braking which may spin you around. Very messy at traffic lights in the wet.

I have used the clubman duel circuit brake master cylinder in the past and found it hard to get a good solid pedal. This time I will be using Cooper S disks with a booster which will make this worse.

Any hints on getting a solid pedal using the clubman duel circuit cylinder, or am I dreaming?

I'm running one in Barney with S brakes and no servo, pedal is nice and hard.
Why would it not be?

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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 have no problems with the pedal pressure - its as hard as a rock. I dont have a booster and I regularly stand on the brakes to pull it up. Mini is a clubman with cooper S brakes.

The hydraulics are a sealed system and once they are fully bled with the rear drums properly adjusted you should have a high pedal and a solid pedal.

It may well be the master cylinder (or the wheel cylinders) are worn and allowing fluid to pass by the pistons and rubbers. Also check that the little locating pin between the top of the pedal and the master cylinder push bar are properly fitted and not worn.

Mini's in general have some issues with brakes but pedal presssure is not one of them generally.

The LS as far as Im aware has the dual circuit master I have 8.4 disks drums rear and I can though don't choose to slam them on in the wet and they pull me up instantly.

I've got dual leyland cyl (mini LS etc) with the original 'S' discs, no booster. I rebuilt it and have no problems with braking on the street, pedal is firm. It's a bit harder to use than with a booster but I prefer the 'feel' without.

Daniel

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