In the old days, only the Austin and Morris Mini Cooper and Cooper 'S' - the cars with 10 ”wheels - were factory-fitted with disc brakes on the front. All other Mini's had to make do with drum brakes all around.
The 'boosting' of the engine still meant that 'the brakes' remained the Achilles heel of the car. Especially at the front, the over-enthusiastic driver had to contend with the so-called fading and therefore had to pedal harder and harder to silence the little thing. If this was done for too long, it could just be that suddenly it was no longer possible to brake at all because the brake fluid boiled ... 'Braking' (in the only correct way) remained a challenge. Soon that group could arm themselves against it. By purchasing adapted lining material. The best result was obtained with Ferodo AM4 brake shoes. These can still be purchased nowadays through the better-stocked car parts trade and therefore perhaps a tip?