Centech 93028 User manual

DIGITAL DISC BRAKE
CALIPER
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http://www.harborfreight.com
Copyright©2005 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.
For technical questions and replacement parts, please call 1-800-444-3353
93028
®

Page 2SKU 93028 For technical questions, please call 1-800-444-3353.
Specifications
Save This Manual
You will need the manual for the safety warnings and precautions, assembly instructions,
operating and maintenance procedures, parts list and diagram. Keep your invoice with this
manual. Write the invoice number on the inside of the front cover. Keep the manual and
invoice in a safe and dry place for future reference.
Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed to
reduce the risk of personal injury and damage to equipment.
Read all instructions before using this tool!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use tools in damp or wet locations. Don’t
expose to rain. Keep work area well lit.
3. Keep children away. Children must never be allowed in the work area. Do not let
them handle the Caliper.
4. Store idle equipment. When not in use, tools must be stored in a dry location to
inhibit rust. Always lock up tools and keep out of reach of children.
5. Use the right tool for the job. Do not attempt to force a small tool or attachment to
do the work of a larger industrial tool. There are certain applications for which this tool
was designed. It will do the job better and more safely at the rate for which it was
intended. Do not modify this tool and do not use this tool for a purpose for which it
was not intended.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically nonconductive clothes and nonskid footwear are
recommended when working. Wear restrictive hair covering to contain long hair.
7. Use eye protection. Always wear ANSI approved impact safety goggles.
8. Do not overreach. Keep proper footing and balance at all times.
Digital Readout Range 0” to 5.7” (0 to 144.8 mm)
Graduations .0005”
Jaw Reach 3-5/8”
Scale Length 6”
Accuracy .001”
Overall Dimensions 9-1/2” L x 4-7/8”W x 1/2” T
Maximum Temperature 105oF
Battery 1.5 Volt (SS44)

Page 3SKU 93028 For technical questions, please call 1-800-444-3353.
9. Maintain tools with care. Keep tools clean for better and safer performance. .
10. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
11. Check for damaged parts. Before using any tool, any part that appears damaged
should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment and binding of moving parts; any broken parts
or mounting fixtures; and any other condition that may affect proper operation. Any
part that is damaged should be properly repaired or replaced by a qualified
technician. Do not use the tool if any switch does not turn On and Off properly.
12. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool. Approved accessories are available from Harbor
Freight Tools.
13. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels if taking prescription medicine to determine if your judgment or reflexes are
impaired while taking drugs. If there is any doubt, do not operate the tool.
14. Maintenance. For your safety, service and maintenance should be performed
regularly by a qualified technician.
Warning:The warnings, cautions, and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
WARNING: The brass components of this product contain lead, a chemical known to the
State of California to cause birth defects (or other reproductive harm).
(California Health & Safety code 25249.5, et seq.)
Unpacking
When unpacking, check to make sure that the product is intact and undamaged. If any
parts are missing or broken, please call Harbor Freight Tools at the number on the cover of
this manual as soon as possible.

Page 4SKU 93028 For technical questions, please call 1-800-444-3353.
Operation
Measuring Disc (Drum Shoe) Pad Thickness
1. Place the Caliper tips on both sides of the “pad backing
plate”, holding the flat side flush with the surface. Do
not apply pressure to the Caliper jaws. Press ZERO.
2. Next, position the Caliper tips around both the backing
plate and pad with the flat tip flush on the backing plate,
and the point in any scoring on the pad. Check the dis-
play, and the reading shown will be the thickness of the
pad. Note: On the drum shoe, the flat tip must be held
flat across the pad.
Set-Up
1. Install the battery as per the instructions on page 6.
2. Press the On/Off button. Press the in/mm button to toggle between the desired unit
reading measurement. Wipe the tips of the Caliper clean and then close the Caliper
until the tips gently touch, and press the Zero button. The display will read, “0.000 or
0.00mm”. Do not force the Caliper closed when getting a reading, or the reading will be
wrong.
Inch Units
Indicator
FIGURE 1
REV 04/05
Note: Before using for any application, follow the zeroing directions in “Set -Up” above.

Page 5SKU 93028 For technical questions, please call 1-800-444-3353.
Operation (continued)
Measuring Ball Joint Play
1. You will be measuring from the top to the bottom of the Ball Joint when the Ball is
moved from the top position to the bottom position.
2. The vehicle must be safely suspended so that the front suspension arms are hanging
loose. Place the Caliper tips at convenient locations both at the top and bottom of the
Ball Joint. Press ZERO.
3. Lift the spindle (wheel) while closing the Caliper on the Ball Joint as the Ball moves
from the top to the bottom position. Once all the play has been removed, check the
digital readout to see the Ball Joint Play. Check with your service manual for allowable
play.
Measuring Disc Rotor Thickness
1. Place the Caliper tips on both sides of the rotor and
lightly close it so that the flat side is flush on the rotor
surface (this side of the rotor must be flat to get an accu-
rate reading). Make sure the pointed tip is in any scor-
ing on the rotor.
2. The display will show the Disc Rotor Thickness. Your
service manual (not included) will state the minimum
allowed rotor thickness.

Page 6SKU 93028 For technical questions, please call 1-800-444-3353.
Maintenance
1. Wipe the Caliper clean with a lint free cloth.
2. Always keep the Caliper in the protective case in the OFF position when not in use.
3. When the battery becomes low, the numeric display will begin to flash. Follow the
directions below to change the battery. Only use a 1.5 Volt (SS44) battery.
Remove the cover. Remove and replace the Battery making sure that you replace the
Battery identically to how the original battery was positioned. Replace the cover.
Note: Other than the battery mentioned above, there are no replacement parts for this unit.
FIGURE 2
Cover
Battery
REV 04/05