hi guys got a bit of a strange 1 my m8 has got a s2 and his brakes wernt the best so he changed them to cossy stuff but when we went to bleed them he just couldnt get the brakes pressure back so we changet the mastercylinder twice no improvememnt changed the brakes back to the s2 stuff no diffrence and even fited new rear cylinders and shoes still no beter eney ideas? also the abs is removed.