IMPORTANT: The later ZOH-T caliper has im-
portant differences from the early ZOPS caliper.
ZOPS calipers (since 1998) and ZOH-T calipers
(since 2002) use different slide pins and bolts.
See
Fig. 10 and Fig. 11. The later trailing pin is
identified by notches and has a rubber bushing.
Flange-head instead of hexhead bolts are used
with the later caliper. The later bolts have a fine
thread rather than a coarse thread pitch, are
longer, differently colored, and are tightened to a
higher torque specification. Use only the ZOH-T
bolts to assemble a ZOH-T caliper. The ZOPS
caliper bolts have a different thread pitch and
will not assemble correctly in a ZOH-T caliper
mounting. Also, the ZOH-T bolts will not as-
semble correctly in a ZOPS caliper. Do not in-
terchange parts. It is permissible to use both
ZOH-T pins and ZOH-T bolts in a ZOPS anchor
plate, but they must be replaced as sets. Both
the pins and the bolts must be changed.
DANGER
The correct pins, bolts, and bolt torque must be
used. If not, brake function could be impaired and
lead to loss of control of the vehicle, which could
result in personal injury, death, or property dam-
age.
IMPORTANT: The ZOH-T caliper assembly is
similar in appearance to the existing ZOPS cali-
per. The only obvious difference is that one of
the anchor plate slide pins (trailing side) has
notches for identification. With ZOH-T calipers,
install the solid pin (no bushing) only in the an-
chor plate leading hole position. Install the pin
with the rubber bushing and notches only in the
anchor plate trailing hole position. Tighten the
leading-side pin first, then tighten the trailing-
side pin.
Tighten ZOH-T bolts 93 to 107 lbf·ft (126 to 145
N·m).
Tighten ZOPS bolts 70 to 80 lbf·ft (95 to 108 N·m).
42–09 Brake Lines Checking,
Hydraulic Disc or Air
Brakes
Check all hydraulic/air lines and fittings for damage,
leakage, or looseness.
Replace damaged or leaking components, and
tighten loose fittings.
42–10 Brake Lining Wear
Checking, Hydraulic
Disc Brakes (front-
engine diesel chassis)
Before checking lining wear with the wheel removed,
review the following brake lining exposure warnings.
f422357
06/20/2002
1
2
3
4
1. Flange-Head Bolt
2. Leading Pin
3. Trailing Pin
4. Rubber Bushing
Fig. 10, ZOH-T Slide Pins and Bolts
f422358
06/20/2002
1
3
3
2
1. Hexhead Bolt
2. Blue Patch
3. Slide Pin
Fig. 11, ZOPS Slide Pins and Bolts
Brakes 42
Recreational Vehicle Chassis Maintenance Manual, July 2018 42/9
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