I'll be replacing rotors, calipers, and soft lines at all four corners next week. I know if I were just purging some air I could bleed the brakes like normal, but since I also want to flush as much of the old fluid out as possible I might need to bleed the ABS
valve assembly as well. From what I understand, you need a special tool from the dealer. Is this still the case, or has someone figured out a way to activate the solenoids without it? Truck is a 2004 4wd Excursion.
If one must use the dealer/specialty tool, I have a backup plan I figured I would try based on a TSB
I read and some (hopefully) common sense. Without the tool, I would have to activate the ABS
manually. According to a TSB
, this can be accomplished by putting the truck up on a frame lift, put truck in 4wd, "drive" truck up to 40MPH and lightly apply brakes. The variation in speed between wheels should activate the system. Well, if I first purge the system of old fluid, I will still have some left in the ABS
. So, I purge, do the ABS
activation to swap out the fluid in that, and then purge again until only clean comes out. At that point I swap the caliper and soft line at one corner, being sure to block off the hard line with saran wrap and a zip tie so no excess air gets into a hard line. I then purge the air and do a final bleed on that corner. I then repeat with the remaining three corners. SHOULD give me a complete flush and proper bleed.
What does everyone think about this method? Or does someone have an alternative for what I'm trying to accomplish?