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Tapering off the leading edge on a drum brake on any motorcycle is vital, if you don’t want it to grab hard and if you are really unlucky lock up. The Joe Dunphy brake that I had relined with oversize Ferodo brake linings where filed down at a shallow 30 degree taper on the leading edge, and I do the same thing whenever I check the brake linings.As for using drum brakes for period racing, if you preferred to use discs you would be put in the non-period class, here in the UK.
Tapering off the leading edge on a drum brake on any motorcycle is vital, if you don’t want it to grab hard and if you are really unlucky lock up. The Joe Dunphy brake that I had relined with oversize Ferodo brake linings where filed down at a shallow 30 degree taper on the leading edge, and I do the same thing whenever I check the brake linings.
As for using drum brakes for period racing, if you preferred to use discs you would be put in the non-period class, here in the UK.