Hi, im new in the forum and im from Mexico, I will try to explain in better way my situation, I recently replace the motor pump from my e63 m6 due to stuck motor and no gain more pressure, yellow trans indicator came on, after opened all the unit, replaced the motor, orings etc, I assembled everything again put new chf11 to the top and I did the bleed block procedure with some air into the reservoir and activate the pump loosening the bottom check valve bolt as jcolley mentiones. Now insta register 58 bar and stays. My problem is when I run the slave bleeding procedure the pressure drops instantly and the bleeding process is cancelled. What is causing the pressure drops too fast into the system if my pump pressure reading is good enough to bleed the entire unit? Fluid level is at maximum, no leaks in all components. Am I missing somethig? Thanks for your help