Cherokee 180 soft brake - causes?

Our A&P hates bleeding Cherokee brakes, but it's more of a repetitive
pain than a really difficult procedure. He just climbs under the wing,
holds the line (or brake assembly?), and has me pump the brakes until
nothing but fluid comes out. It can take several pumps, and uses a bit
of brake fluid, but it works well. (I've not seen what he's doing under
there, since I'm inside the plane, but he's catching the fluid in a
container of some sort.)

They can't be bled from the bottom up?

They can, but this is my A&P's method of preventing the OP's problem of
eternally soft brakes. It apparently ensures that no air is left hiding
anywhere in the system.

All I know is that it works. My brakes aren't mushy.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"