[QUOTE="Sam"] If your Zafira is still under warranty, a Vauxhall Dealer should replace the squealing rear calipers without any hassle. Otherwise I've read that the job could be more than £300 ! This (loud squealing) happened in dry weather rather than wet, and only when reversing. If your VIN number is between WOLOTGF7522199742 and WOLTGF7522229096 (recalled because a batch of brake caliper pistons may release hydrogen gas into the brake fluid - if faulty the calipers are replaced) , then hopefully Vaux should do repairs even if out of warranty . I wondered if the calipers were occasionally making the pads touch the discs (without pressing the brake pedal !)which would affect mpg ? . [/QUOTE] Ok thanks for the heads up Sam; I'll see what the VIN is when I get home.