14
2. CALIPER RUNNING CLEARANCE
CAUTION: Follow all standard safety procedures
including, but not limited to, those on page 2 of this
service manual. See the vehicle manufacturer's
recommendations. When working on foundation
brakes, be sure that the vehicle is on level ground,
that the vehicle is parked by other means than the
foundation brakes, and that the wheels are chocked.
CALIPER MOVEMENT TEST
Remove the wheel. With the spring brakes caged, push
the caliper assembly inboard on its guide pins. Using a
suitable tool, press the inboard pad (12) away from the
tappets and check the gap between the tappet and the
inboard pad backplate - it should be between 0.024 in.
(0.6 mm) & 0.043 in. (1.1 mm).
If the movement is within
the range there is no need to inspect further.
CAUTION: If the clearance is too wide, there is a danger
of brake failure. If the clearance is too small, there is a
danger of overheating. That may lead to consequential
damage.
If there is no movement at all, go to pages 16-17 for
the “Guide Pin Inspection Procedure.”
If instead, there is movement, but the running
clearance is too small or too large, the adjuster may
not be functioning correctly and should be checked.
See “Inspect Adjuster Mechanism” on Page 15.
FIGURE 23 -
MEASURING
THE RUNNING
CLEARANCE
CONTACTING BENDIX
www.foundationbrakes.com
Bendix on-line information is available 24/7. In the on-line contacts directory, you can find:
technical support contacts; service engineers; Bendix account managers; international
contacts and more. www.foundationbrakes.com is your complete Bendix resource.
Bendix Technical Assistance Team
For direct personal technical support, call the Bendix technical assistance team at:
1-800-AIR-BRAKE
(1-800-247-2725),
Monday through Friday, 8:00 A.M. to 6:00 P.M. EST, and follow the instructions in the
recorded message.
Alternatively, you may e-mail the Bendix technical assistance team at:
To better serve you, please record the following information before you call the
Bendix Tech Team, or include this information in your e-mail:
• Bendix product model number, part number and configuration.
• Vehicle make and model.
• Vehicle configuration. (Number of axles, tire size, etc.)
• System performance symptoms: When do they occur?
• What troubleshooting/measurements have been performed?
• What Bendix service data literature do you have or need?
