Instructions For Bleeding Hydraulic Brake System - Lincoln industrial Mityvac MV6870 Manual Del Usuario

InsTrucTIons For bleedInG HYdraulIc brake sYsTem

ImPorTanT: This unit is designed for servicing
a variety of vehicles in a safe, convenient manner.
However, options such as load sensors or antilock
brakes, available on many automobiles, may
require additional steps or equipment to perform
a proper service job. The procedures below are to
serve as guidelines for the use of this equipment,
in addition to these guidelines, always follow the
manufacturer's recommended procedures when
servicing each unique vehicle.
note: Prior to bleeding, ensure the master cylinder
is full of new manufacture's recommended brake
fluid. Use of an automatic master cylinder refill kit
such as Mityvac model MVA6832 is recommended
with the vacuum bleeder to maintain the level of
new fluid in the master cylinder during the brake
bleeding process. Follow the instructions included
with the kit to prevent air from being sucked into
the master cylinder pistons, brake lines, and wheel
cylinders while bleeding the brakes.
1. Properly position the vehicle for safe conve-
nient access to the brake bleed screw located
on each wheel brake cylinder.
2. Make sure that all bleed screws are clean.
3. Connect clean, regulated (60 psi (4.1 bar) to
150 psi (10.3)) compressed air to the male
quick change nipple extending from the
vacuum bleeder handle.
note: Consult the vehicle manufacturer's
guidelines for the proper wheel bleeding se-
quence and vacuum bleeding procedure.
4. Slip the bleed screw adapter on the end of the
bleed tube assembly, over the nipple of the
bleed screw.
5. Operate the vacuum bleeder by squeezing
the handle (allow a few seconds for vacuum
to build in the bleeder reservoir before suction
occurs), and with the appropriate wrench,
loosen/open the bleed screw slightly, until fluid
is visibly draining through the bleed hose and
into the reservoir.
note: During the bleeding process, as brake
fluid is being vacuumed through the bleed
screw, air will also be sucked into the bleed
tube from around the bleed screw threads.
Form 801001
This can give the misconception that air is
bleeding from the lines, however it is normal
and does not indicate a malfunction. To pre-
vent or reduce this introduction of air, coat the
bleed screw threads with silicon grease prior
to bleeding.
6. Keep the bleed screw open until new fluid is
visibly flowing through the bleed tube (typically
20 to 30 seconds).
7. Close the bleed screw firmly, without over
tightening, prior to removing the bleed screw
adapter or shutting off the bleeder.
note: It is important to ensure that the bleed
screw adapter remains connected to the
bleed screw, and the bleeder is still pulling a
vacuum while the bleed screw is closed. This
prevents air from being sucked back into the
wheel cylinder from around the bleed screw
threads, before the bleed screw is tightened
and sealed.
note: If a master cylinder auto-refill system
is not used, be sure to periodically check the
level and top off the brake fluid in the master
cylinder.
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