Before few days, after find oil spot under rear tyre I changed rotten small metal pipe on rear caliper, there I loose oil (conection of both sides of caliper pistons). Deinstal rear caliper and made new metall pipe. During repair and check all parts of caliper, I was forced to block one, inner bleeding ventile, near to ABS sensor, when I broke him (lot of rust, unable to unscrue him, and pull him out and try replace with another, and this one not holding presure and leaking, that is reason to block him. Now have only one (know is faster to remove air if bleeding both, but I bleed only one of them, outside one). Try to remove air from sistem, first on ABS, bleeder for rear brakes, then rear caliper, but my brake lever is still soft. After few pumping, brake work, but few second latter, soft again.. How to remove all air from system ?