Geo Hahn said:
...I would call it 'pressure' rather than 'suction' if that helps.....
Griot's "One-Person Brake Bleeder" is a suction bleeder, not a pressure bleeder.
The unit has a venturi vacuum generator that creates suction by for forcing compressed air through a constriction.
This is a major improvement over the hand pump style vacuum bleeders like a
Mightyvac, which are a royal pain in the palm to keep pumping.
Griot's "Reverse Brake Bleeder Kit" is a pressure pressure bleeder.
KVH said:
.... That doesn't seem to equate to a heavy foot forcing air out of a line.
A heavy foot only speeds up the process. Light pressure or suction moves the fluid ok (it's incompressible), just slower.
For me, the biggest drawback to suction bleeders like Griot's and Mityvac, pressure bleeders like that diy rig Bob referenced and one-man pedal pump bleeding a la
Speedbleeders is that it's too easy to lose track of how much fluid you've moved and suck/push air into the system.
I prefer systems that replaces the fluid as you bleed like
Motive Porducts,
Eezibleed or
Griot's "Reverse Brake Bleeder Kit".
pc