Join Date: Aug 2007
Location: Staunton, VA - USA
Essentially, the accumulators self-bleed.
If you have any air in the accumulators it is the first thing pushed out toward the end points when you have the brake pedal partially depressed and are opening the bleed screws. They also "self burp" during the initial fill cycle in most cases - the air gets pushed out by the incoming fluid and returned to the reservoir where, of course, it simply escapes.
If someone wants to be really, really cautious, then do your first pressure accumulation, turn the car off, return the key to the run position, and do the brake pedal test until your brake warning light(s) illuminate plus maybe 20 or 30 more presses. This completely empties whatever is in the accumulator and when it refills any air that might have been between the reservoir and the input to the ACV was pushed out long ago by the initial pressurization, and nothing but fluid goes in.
I've actually not bothered to bleed the accumulators when I've done this job myself. All indications are that it's not necessary and, if I really want to ensure the accumulators are bled I'd rather do a depressurize/pressurize cycle with the brake pedal. I have no great love for either RR363/YAK363 or HSMO/LHM and the messes that can come about during bleeding, particularly at the accumulator, if your hand slips or the tubing comes off the bleed nipple somehow. Been there, done that, was "slimed".
The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. ~ Niels Bohr