Below from the Repco PBR service manual.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Too much information for me....!

If you want it to stop like a race car don't fit a booster. (but be prepared to press the pedal hard)
If you want it to stop like a modern road car fit a booster.

I have no booster and greenstuff pads. Coming out of a modern car and into the mini, braking makes me pucker every now and then when I forget how hard I have to press the pedal on the mini. I'm always a bit concerned it's not going to pull up, but thankfully it does. Great pedal feel but you really have to press hard.

I'm watching this thread with interest as I'm seriously considering getting a booster too.

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1970 Mini Deluxe - 1275, Weber, Clive 346 cam, MS 4-pot slotted discs, Megajolt ignition Now with new improved Mambas... almost on the road
1966 Van with Traveller rear seat conversion
2008 Prado GXL
All in various states of repair...

The Cooper S ran a very high boost pressure. The Australian Cooper S was designed for winning Bathurst.
Why would a race/rally car need high boost pressures? Because they had very hard pads to last the race/rally without needing a pad change. These pads needed lots of boost to pull up. (take the booster off and you would be lucky to be able to lock a wheel at all)
These days you could run a lower pressure booster with modern pads and stop much easier.

"The Australian Cooper S was designed for winning Bathurst."

I would have thought in that case, sliding window doors would have used, much lighter but I learn something everyday.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

They still had to meet local content rules in order to produce them.

Could we not produce sliding window doors, anyway off topic sorry.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

I would boost.... Lol