Page Number - 6
Form 801661B
continue to flow as long as there is vacuum in
the reservoir and the shutoff valve is open .
7 . Once the required amount of fluid has been
evacuated or the fluid transfer bottle is full,
close the shutoff valve and release the vacuum
in the system by activating the pressure relief
lever on the hand pump .
8 . If no future use of the evacuated fluid is
intended, dispose of it properly, clean the fluid
transfer bottle assembly with denatured alcohol
or a common household cleaner, and store it
properly .
Brake Bleeding
Many brake systems today feature Anti-Lock
functions and electronic controls that use a high
pressure electric pump to keep the system pressur-
ized . Bleeding or servicing these systems requires
special procedures and cautions . Always observe
the following precautions when servicing Anti-Lock
brake system:
•
ALWAYS wear safety goggles when servicing
high pressure brake systems
•
ALWAYS depressurize the ABS system prior to
adding fluid or attempting service or repair
•
Unless instructed to by the manufacturer’s
procedure, NEVER open a bleeder valve or
loosen a hydraulic line while the ABS system is
pressurized
•
ONLY use recommended brake fluids . DO
NOT use silicone brake fluid in ABS equipped
vehicles .
•
Always refer to an appropriate repair manual
for additional information on Anti-Lock brake
systems .
Depressurizing Anti-lock Brake Systems
Always refer to the vehicle owner’s manual or ap-
propriate service manual for additional information
on the depressurizing procedure . The following
procedure will work on most Anti-Lock brake
systems:
1 . Ensure ignition switch is in the OFF position or
disconnect the negative battery cable .
2 . Pump the brake pedal 25 to 40 times, until a
noticeable change is felt . Continue to pump
the pedal a few additional times . This should
eliminate most system pressure .
3 . Open fluid reservoir or brake lines carefully .
Top off reservoir fluid and reconnect battery
cable when finished .
Bleeding Anti-lock Brake Systems
•
Always refer to the vehicle owner’s manual or
appropriate service manual for manufacturer’s
brake bleeding procedure .
•
The front brakes on most Anti-Lock brake sys-
tems may be bled in the conventional manner .
•
Most hydraulic pump/pressure accumulator
units are fitted with a bleeder valve which must
be bled when the system has lost fluid or is be-
ing replaced .
•
Some vehicles require the system be
pres¬surized when the rear brakes are bled .
•
Some automotive manufacturers use bleeding
procedures that require specialized equipment .
Pressure Bleeding
The Fluid Transfer Accessory Kit is appropriate for
use as a pressure bleeder for hydraulic brake and
clutch systems . Additional accessories and adapters
may be required and are available from Mityvac for
performing this function .
Pressure bleeding is quick and easy because:
•
it does not require an assistant
•
it maintains pressure in the system while bleed-
ing multiple locations
•
it keeps the master cylinder full during bleeding
The kit can also be used to identify the presence
of leaks in an automotive hydraulic brake or clutch
system . Leaks are indicated by a drop in pressure
over a few seconds or minutes . The locations of
leaks can be pinpointed by visible seepage of fluid
from the system while under pressure .
WARNING: Hydraulic/brake fluid is hazardous and
corrosive . Take precautions to protect painted sur-
faces and skin from exposure, and read and follow
the fluid manufacturer’s warnings and instructions .
Always wear safety goggles when working with
brake fluid .
CAUTION: Use your Mityvac Pressure Bleeder only
as directed . Read these instructions completely
before attempting to service brakes . The Mityvac
Pressure Bleeder is intended for use only by
individuals experienced with bleeding and servic-
ing brake systems . If you are unsure about how
to properly service your vehicles brake system,
consult a trained professional . Always follow the
vehicle manufacturer’s directions when bleeding
the brake system .
1 . Ensure the vehicle is properly positioned for
safe, convenient access to the master cylinder
and the brake bleed screw located on each
wheel brake cylinder . Set the parking brake,
turn off the engine, and open and secure the
hood .
2 . Locate the brake or clutch master cylinder and
remove the cap .
