Great trick Sig! Do us late model guys have to bleed the ABS HCU if we install a new master cylinder? Logical sense says yes, but its always better to SEARCH and ask
Alright SIGEP I have made up four low impedance jumper wires with hat pins soldered on one end and alligator clips on the other. Just want to clarify something here. The way I read this I am assuming you are back probing each of the dumps on the abs module harness, correct? Also do you leave the relay grounded when you ground circuit 539 for one minute?Perform conventional brake system bleed.
Prepare an appropriate method of connecting individual circuits and wires to ground. This connection must be sound, with very low impedance to the battery negative terminal (I used some stainless hat pins and alligator clips on test leads).
Turn the ignition switch to the ON position.
While an assistant presses down on the brake pedal:
*a. ground circuit 599 [PK/LG], pin 19. (4WABS Relay #1)
b. ground circuit 510 [T/R], pin 27. (Rear Dump)
c. ground circuit 498 [PK], pin 15. (Right Front Dump)
d. ground circuit 496 [O], pin 26. (Left Front Dump)
-- the pedal will fall.
Disconnect the ground connections made in parts 4b, 4c, and 4d. *Leave the connection made in part 4a. Allow the brake pedal to return.
Repeat steps 4 and 5 once more.
Ground Circuit 539 [PK/LB], pin 29 for one minute. The ABS pump motor should run for the entire minute.
Perform conventional brake system bleed.