My old French (Paris Sport) bike has lasted very well over nearly 50 years and is now assisted by a powered front wheel and rear mounted battery. I am wondering whether it is worth changing from front and rear cable rim brakes. These are fine in dry weather but less so when the rim is wet, The front (powered) wheel could take a disc but not I think the rear wheel. So the options for improved braking seem to be front disc or Magura hydraulic rim-brake with the rear braking being cable or hydraulic rim-brakes. Any comments? Peter