I have known several people who still have single master cylinders on there classic cars with front disc brakes and all have said they have never had any problems stopping there cars.
Don’t think so………disc brakes run on about twice the pressure as drums. So single master on disc/drum vehicle is not going to work.
Stock OE master with disc brakes is NOT an upgrade.
Power brake dual master cylinder disc kits are not mystery or new concept. Q
