On Mar 27, 9:34*am, Dick wrote:

We have sucked the system dry by vacuum applied, also to the
same nipple.

I assume you actually didn't mean that since sucking the system dry
ensures that it is totally filled with air unless you used a high
vacuum pump.

Getting a high flow rate using either suction or pressure usually
works but you need a fluid reservoir large enough to sustain the
flow. My PA28-180 has 5 master cylinders and 2 slave cylinders and is
a real bitch to bleed after the system has been opened. I used a pump
up garden sprayer to feed fluid to the caliper bleed nipples and used
a large bottle to catch the overflow from the reservoir.

So far I've had no problem with the hydraulic brake on my 28 so no
experience with that yet.

Andy