Several topics about ABS and pad replacement. It is essential that the hoses be blocked and the pressure relieved with the bleeder screw when pressing the caliper back into the bore. If this is not performed correctly it allows the gunk(from the seal) to enter the ABS system this usually presents itself as a ABS lite that wont turn off or it feels as if there is air in the system. A flush may cure the problem but it usually require serious and expensive repair or replacement of some ABS componets. Be cautios what you use to block the hose there are plastic pliers that clamp that work the best and they are not that expensive just be sure you do not damage the hose.Also any time I do a brake repair I replace the fluid, simply run fluid through the system until it runs clear no need to apply pressure just keep the MC full for all 4 wheels also on GM rear disc carefully inspect the slider bolts they are usually frozen as no one uses there emerg brake.