Yeah, what you've done is the same as I did. I bled my brakes with wd40. Its alright until you snapp the croosover and have to bleed again. I didnt have any wd left so I bled with water. But when you pump the water up to the lever, a load of black shit comes out, really gungy and gooey. And I thought, Itll be reet. But then when I finished up my brake was wank. So the best thing to do is take your cylinders out and stick the bleed tube into one of the wholes and get a track pump attach it to the tube and blow air into the cylinders to blow all the crap mixture of wd and water out. Because the mixture is sticky and It can block up your pipe etc. So the best option is to blow it all out. Then lube the pistons etc, making it smoother again. Basically you've got loads of shit in your brake thats not working to lubricate the brake. You need something to push agaisnt each other etc. nd your brake is full off gunge. So clean it all out. Then grease up or whatever then bleed it. Should do the trick. But If it doesnt let us know. Andd never use Dot fluids rots your brake down. Use water. WD40. Or the standard magura mineral oil. But make sure your nrake is clean before you rebleed. Because your just filling it with shit... Oli x