User's Manual

10
Section Four
Section Page
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4.0 WHEEL-OFF INSPECTIONS
CAUTION: During these inspections, follow all safe
maintenance practices, including those on page
two of this service manual. Also, follow 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.
4.0.1 Wheel Removal and Re-Installation
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WARNING: Not all wheels and valve stems are
compatible with Bendix Air Disc Brakes. Use only
wheels and valve stems approved by the vehicle
manufacturer to avoid risk of valve stem shear and
other compatibility issues. $IWHUUHLQVWDOOLQJ D ZKHHO
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SECTION FOUR: WHEEL-OFF MAINTENANCE INSPECTIONS
4.1 CALIPER MOVEMENT TEST
CAUTION: Follow all safe maintenance practices.
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Note: To fully release the spring brakes, assure that the
air system pressure is at least 90 PSI. 8VLQJDVXLWDEOH
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within the range given, the test is complete.
Pull
Caliper
Inboard
FIGURE 15 - PULL CALIPER INBOARD
Check the clearance at
both tappets simultaneously:
0.024 in. to 0.043 in.
(0.6 mm. to 1.1 mm.)
FIGURE 16 - RUNNING CLEARANCE CHECK
CAUTION: If the clearance is too wide, there is a
danger of brake failure. If the clearance is too small,
or if there is no gap at all, there is a danger of the brake
overheating. These conditions must be corrected
before returning the vehicle to service.
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