Holden Astra 2001: Should the brake rotors need replacing at 50,000km?

This is not unusual with the Astra which, like all European cars, chews through brakes, both pads and discs, quickly. It seems unusual that both front and rear discs should need replacing at such low kilometres, and at the same time. You'd normally expect the front discs to wear faster than the rears, but I have heard of similar cases with the Astra. You could try taking it up with Holden as a warranty claim, but I think you'd find they consider disc rotors as consumable items not covered by the warranty.