[Alec Dawe]

I always thought that Rotors was wot a helicopter had to get if to fly.

I reckon you'll have a hell of a job getting a V70 off the ground with those. Disc brake discs however should always be replaced in pairs or you get the probability of unever braking distribution from side to side, and pulling to, one side when under heavy braking.

I always understood that the brake discs were only sold in pairs, and that the pairs were machined from the same 'cast' of metal as well, in case of minute friction characteristic differences between different 'casts' of metal.