Hydraulic brake problems

On Mar 28, 7:37*am, Andy wrote:
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

3U hit the nail on the head for 'cause'. Automotive brake fluid, used
as we do (infrequently, by automotive standards) really needs to be
fully cycled out annually to prevent excessive water absorbtion and
the attendant corrosion. I've been changing out brake fluild in my
cars on a bi-annual basis since the 70's, and haven't had to replace
or rebuild a caliper, slave, or master cylinder since that time (and I
tend to keep vehicles for decades).