I renewed all the discs and pads recently on my Willy 2 - DS2500s at the front and Mintex M1144 at the rear. However the car's squealing madly from the rear when I brake while reversing. There were anti-squeal shims on the rears when they were changed, but these didn't fit with the new Mintex pads so we left them off. am i better off just sticking some OE pads which will fit with the shims?