Harbor Freight Tools PITTSBURGH AUTOMOTIVE 63391 Assembly instructions

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Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back
of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep
this manual and the receipt in a safe and dry place for future reference. 20j
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2018 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
To ol s r eq ui r ed f o r as s em bl y a nd se rvice m a y not be i nc luded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Page 2 For technical questions, please call 1-888-866-5797. Item 63391
Specifications
Gauge Range 0-30 IN. of mercury (in Hg)
Important Safety Information
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS
Failure to follow instructions listed below may result in serious injury.
SAVE THESE INSTRUCTIONS
1. Keep bystanders, children, and
visitors away while operating the
Vacuum Pump. Distractions can
cause you to lose control. Protect
others in the work area from injury.
2. Stay alert. Watch what you are
doing, and use common sense
when operating the Vacuum Pump.
Do not use the tool while tired
or under the influence of drugs,
alcohol, or medication. A moment
of inattention while operating the tool
may result in serious personal injury.
3. Dress properly. Do not wear loose
clothing or jewelry. Contain long
hair. Keep your hair, clothing, and
jewelry away from moving parts.
Loose clothes, jewelry, or long hair
can be caught in moving parts.
4. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance
enables better control of the tool
in unexpected situations.
5. Use safety equipment.
Wear ANSI-approved safety glasses
underneath a full face safety shield.
Nonskid safety shoes, hard hat, or
hearing protection must be used
for appropriate conditions.
6. Do not force the tool. Use the
correct tool for your application. The
correct tool will do the job better and
safer at the rate for which it is designed.
7. Store idle tools out of reach of
children and other untrained
persons. Tools are dangerous in
the hands of untrained users.
8. Maintain tools with care. Keep
tools dry and clean. Properly
maintained tools are less likely to
bind and are easier to control. Do not
use a damaged tool. Tag damaged
tools “Do not use” until repaired.
9. Check for misalignment or binding
of moving parts, breakage of
parts, and any other condition that
may affect the tool’s operation.
If damaged, have the tool serviced
before using. Many accidents are
caused by poorly maintained tools.
10. Use only accessories that are
recommended by the manufacturer
for your model. Accessories that may
be suitable for one tool may become
hazardous when used on another tool.

Page 3For technical questions, please call 1-888-866-5797.Item 63391
11. Tool service must be performed
only by qualified repair personnel.
Service or maintenance performed
by unqualified personnel could
result in a risk of injury.
12. When servicing a tool, use only
identical replacement parts. Follow
instructions in the section of this
manual. Use of unauthorized parts
or failure to follow maintenance
instructions may create a risk of injury.
13. Maintain a safe working
environment. Keep the work area
well lit. Make sure there is adequate
surrounding workspace. Keep the work
area free of obstructions, grease, oil,
trash, and other debris. Do not use
this product in a damp or wet location.
14. Maintain labels and nameplates
on this product. These
carry important information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
15. Keep the handle dry, clean, and free
from brake fluid, oil, and grease.
16. Before use read and understand
all warnings, safety precautions,
and instructions as outlined in the
vehicle manufacturer’s service
manual. Every vehicle has specific
measurement values for vacuum
related readings. It is beyond the
scope of this manual to properly
describe the correct procedure
and test data for each vehicle.
17. Carbon monoxide is produced
while a vehicle’s engine is
operating and is deadly in a closed
environment. Early signs of carbon
monoxide poisoning resemble the
flu, with headaches, dizziness, or
nausea. If you have these signs,
the work area may not be vented
properly. Get fresh air immediately.
18. People with pacemakers should
consult their physician(s)
before use. Electromagnetic fields
in close proximity to heart pacemaker
could cause pacemaker interference or
pacemaker failure.
Caution is necessary when near coil,
spark plug cables, or distributor of
running engine. Engine should be
off during distributor adjustment.
19. Prior to using the Vacuum Pump,
place the vehicle’s transmission
in “PARK” (if automatic)
or “NEUTRAL” (if manual).
Then, block the tires with chocks.
20. Be alert for hot engine components
to avoid accidental burns.
21. Use the Brake Bleeder only with
brake fluid. Do not attempt to
use the tool to siphon any other
liquids. Damage to the internal
chamber and seal, or future brake
fluid contamination may result.
22. Follow guidelines for proper
brake fluid disposal. Used brake
fluid should be removed from the
vehicle and properly recycled.
Many states require recycling.
Contact your local solid/liquid waste
authority for information on recycling.
Do not reuse old brake fluid.
23. Brake fluid may damage paint.
Clean up spilled fluid quickly.
24. The warnings, precautions, and
instructions discussed in this manual
cannot cover all possible conditions
and situations that may occur. The
operator must understand that common
sense and caution are factors which
cannot be built into this product, but
must be supplied by the operator.

Page 4 For technical questions, please call 1-888-866-5797. Item 63391
Setup Instructions
1. Open the Cup (3).
2. Seat the O-ring (11) completely into
the groove in the top of the Cup.
3. Remove the shipping spacer that
prevents the Vacuum Pump (1) handle
from moving through its full range.
4. Cover the inlet of the Vacuum Pump
with something such as a plastic bag.
To prevent injury, DO NOT USE
YOUR SKIN TO PLUG THE INLET.
Operate the pump several times to
create the vacuum. The vacuum
should not decrease quickly. If air
is entering through the vacuum
release valve, tighten it. After the
pump properly holds a vacuum,
press in the Pump’s vacuum release
valve to release the vacuum.
Set the plastic bag aside.
5. The vacuum pump should
now be ready for use.
Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the
beginning of this document including all text under subheadings therein
before set up or use of this product.
Vacuum System Testing
1. Position the vehicle in a flat, level
outdoor area. Set the parking
brake and chock the tires.
2. Attach a 23" Hose (4) to
the Vacuum Pump (1).
3. Attach the other end of the Hose to
the vacuum system. Keep clear of
parts that will move or get hot while
an assistant starts the engine.
Wait until the vacuum reading
stabilizes and compare it to the
manufacturer’s specification.
4. After obtaining a measurement,
shut off the engine.
5. A low or unstable vacuum reading
may mean a vacuum leak,
vacuum line blockage, cylinder
sealing problems, incorrect valve/
ignition timing, or other issues.
Note: Vehicle vacuum systems will
differ. Consult the vehicle’s service
manual for proper testing procedures.
6. After testing is complete, disconnect
the Vacuum Pump and Hose,
remove any plugs or clamps
and secure all vacuum lines.

Page 5For technical questions, please call 1-888-866-5797.Item 63391
Brake Bleeding
1. Attach a 3" Hose (5) to the
bottom of the Suction Lid (2a).
2. Attach a 23" Hose (4) to the port on
the top of the Suction Lid that does not
have the 3" Hose attached, as shown in
Figure A. Then, attach the other end of
that 23" Hose to the Vacuum Pump (1).
3. Make sure the O-ring (11) is completely
seated into the groove on the top of
the Cup to provide a good seal. Firmly
attach the Suction Lid to the Cup (3).
4. Remove the cap from the vehicle’s
master cylinder, and make sure the
master cylinder is full of brake fluid.
If not full, fill the master cylinder
to capacity with clean, new
brake fluid. (Use only the kind
of brake fluid recommended by
the vehicle manufacturer.)
Note: Determine the proper brake bleeding
sequence from your vehicle service manual
(i.e., right rear wheel, left rear wheel,
right front wheel, left front wheel).
5. Connect the 23" Hose (4) to the
remaining port on the Suction Lid.
6. Insert the Tapered Hose Adapter (6)
into the 23" Hose. Connect the
other end of the adapter to the
Brake Bleed Screw Adapter (9).
7. Squeeze the Handle of the
Vacuum Pump 10 to 15 times to
create a vacuum in the Cup.
Note: The Gauge on the Vacuum Pump
should read at approximately 10 inHg.
Do not exceed 20 inHg. A greater vacuum
could damage the vehicle’s brake system.
8. Open the vehicle’s brake caliper
bleed screw, and allow brake
fluid to flow into the Cup until fluid
appears clear and free of bubbles.
Then, retighten the bleed screw.
FIGURE A
23" HOSE (4)
BRAKE BLEED
SCREW ADAPTER
(9a, 9b, OR 9c)
TAPERED
HOSE
ADAPTER
(6)
23"
HOSE (4)
TO BRAKE CALIPER
BLEED SCREW
3" HOSE (5)
SUCTION
LID (2a)
O-RING (11)
CUP (3)
PUMP
SCREW
VACUUM
PUMP (1)
GAUGE
VACUUM
RELEASE
VALVE

Page 6 For technical questions, please call 1-888-866-5797. Item 63391
9. Release the vacuum in the
Vacuum Pump (1) with the
Vacuum Release Valve.
Then, disconnect the Brake Bleed
Screw Adapter (9) from the vehicle’s
brake caliper bleed screw.
Note: Do not allow the cup to fill completely
with brake fluid. When necessary, release
the vacuum in the tool and empty its Cup (3)
of old brake fluid. To assist in transport,
this set includes a Transport Lid (2b)
without hose connections.
After the brake fluid is disposed of
properly, resume bleeding the brakes.
10. Remove the cap from the vehicle’s
master cylinder, and refill the master
cylinder back to its normal capacity
with clean, new brake fluid. Then,
replace the cap on the master cylinder.
11. Proceed to the vehicle’s next
brake caliper, and perform the
same steps as above.
12. When finished using the Vacuum Pump,
clean the tool and store it in a clean,
dry location out of reach of children.
13. WARNING! Before driving the
vehicle, carefully check for leaks and
test for proper brake operation.
Maintenance and Servicing
1. Before each use: Inspect the general
condition of the Vacuum Pump.
Check for misalignment or binding of
moving parts, cracked or broken parts,
damaged Hoses, loose connections,
and any other condition that may
affect its safe operation. If a problem
occurs, have the problem
corrected before further use.
Do not use damaged equipment.
2. When cleaning: Do not clean the
Vacuum Pump with cleaners or other
solvents. Use a clean, dry cloth.
Do not immerse the Vacuum
Pump in any liquid.
3. When storing: Do not store fluid
in the Cup. Dispose of excess
fluid properly, according to federal,
state, and local guidelines.
Store the Vacuum Pump in a clean,
dry location out of reach of children.
4. WARNING! All maintenance,
service, or repairs not listed in this
manual are only to be attempted
by a qualified service technician.

Page 7For technical questions, please call 1-888-866-5797.Item 63391
Parts List and Diagram
Part Description Qty
1 Vacuum Pump 1
2a Suction Lid 1
2b Transport Lid 1
3 4 oz. Cup 1
4 1/4" x 23" Vacuum Hose 2
5 1/4" x 3" Vacuum Hose 2
6 Tapered Hose Adapter 2
Part Description Qty
7 “T” Hose Connector 1
8 Straight Hose Connector 1
9a Brake Bleed Screw Adapter A 1
9b Brake Bleed Screw Adapter B 1
9c Brake Bleed Screw Adapter C 1
10 Universal Cup Adapter 1
11 Cup O-Ring 1
1
2a
2b
11
3
4
5
67
8
9c
9b
9a
10

Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase. This
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to
you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint
must accompany the merchandise. If our inspection verifies the defect, we will either repair or
replace the product at our election or we may elect to refund the purchase price if we cannot
readily and quickly provide you with a replacement. We will return repaired products at our
expense, but if we determine there is no defect, or that the defect resulted from causes not
within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER
OR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE
BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR
THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE
MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS
REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS,
AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF
HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO,
OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 193175358622 when ordering parts.