[aussie merc]

which ever way you go you will need to do a total system change front and rear as brakes are a balanced system [front and rear] you need to do the sums which often have hidden costs such as new tyres and wheels. Yes discs do have less fade but often dont work that well when there cold not totally familiar with your current brake system but something as simple as a remote booster [VH40/44] can be quite effective or even changing the lining material can change how your brakes preform. Brake fade is caused by linnings overheating how and why there are too many factors to go into here and can often depend on where you live ie live in hilly country your brakes work harder and longer than the wide open spaces find a brake specialist and talk to them it cant hurt .Also check to see if anyone has been in there before and changed something something as simple as changeing cylinder size as little as a 16th" has major effects and check all your flex lines if they have gone soft they will balloon and cause mass dramas and near impossible to diagnose [rule of thumb change every 10 years ]