hello , trying to decipher the google translation of the posting , but it seems that you have sourced and are using A4 rear brake calipers on your 4x4 , i am asking as i wish to build a 4x4 from parts into a old 2wd bodyshell i have . I have a 4x4 rear axle and subframe but no calipers ,and although these can be sourced from mk3 mondeo /jag , they to seem to suffer from the same problems as 4x4 ones after awhile, so A4 ones are better maybe.