I've had new disks and pads on the rear, plus a new caliper as it was sticking on.

Ever since, i've had a knocking noise (faster you go, the faster it sounds) which goes away as soon as you press the brake pedal.

I took it back to the Garage who said it is the dust seal on the other caliper causing the problem as it was perished and wasn't sitting right. They said it should cause an issue, just annoying with the noise.

Does this sound like b0ll0cks? Im going to get a second opinion anyway, just thought id ask if anyone else has had this issue?