pressure brake bleeder is a tool that enables brakes to be bled
quickly and easily. It is the tool of choice for this purpose in
professional workshops yet need be no more expensive than a vacuum
brake bleeder (one problem of which is it tends to pull in air from
around the bleed fitting). Basically, a pressure bleeder consists
of a storage tank with two reservoirs separated by a diaphragm.
The lower reservoir is filled with enough brake fluid to completely
flush the system, while the upper part is pressurized to about 15
psi (as metered by a gauge attached to the bleeder). The brake fluid
reservoir is connected by a hose to an adaptor on the master cylinder.
A valve in the hose is opened slowly causing old or contaminated
fluid to be forced out while, at the same time, new fluid from the
pressure tank is added.