Thomas SAF-T-LINER C2, Maintenance Manual

Page: 121 / 176

Apply 1/8 oz (3.5 g) Aeroshell Grade 5 grease to
each of the two slide pin and slide pin bore sets. See
the
Bosch Pin Slide Disc Brakes Service Manual for
additional information.
With ZOH-T calipers, install the solid pin (no bush-
ing) only in the anchor 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). See
Fig. 9 .
42–13 Drum Brake Shoe Roller
Lubricating
WARNING
Breathing brake lining dust (asbestos or non-
asbestos) could cause lung cancer or lung dis-
ease. Unless exposure can be reduced below legal
limits, wear an air purifying respirator approved
by MSHA or NIOSH at all times when servicing the
brakes, starting with removal of the wheels and
continuing through assembly.
1. Park the vehicle on a level surface. Shut down
the engine, set the parking brake, and chock the
tires.
2. Raise the front or the rear axle and then place
safety stands under the frame or axle. Be sure
that the stands will support the weight of the ve-
hicle.
3. Remove the wheels and the brake drums.
CAUTION
Before you back off automatic slack adjusters, see
the slack adjuster manufacturer’s service informa-
tion for instructions. Failure to do so could result
in damage to the slack adjusters.
4. Back off the slack adjusters.
5. Push down on the bottom brake shoe and then
(by pulling on the roller-retaining clip) remove the
bottom cam roller.
6. Lift the top brake shoe and then (by pulling on
the roller-retaining clip) remove the top cam
roller.
7. Thoroughly clean the rollers, retaining clips, and
the roller pin recesses in the brake shoes.
Do not apply grease to the outer diameters of
the rollers (where they contact the cam head).
8. Apply a good-quality, multipurpose chassis
grease to the retaining clips, brake spider, and
the shoe rollers where they contact the brake
shoes.
9. One at a time, pull each brake shoe away from
the cam and install the top and the bottom shoe
rollers.
10. Install the brake drums and the wheels.
DANGER
Do not operate the vehicle until the brakes have
been adjusted and checked for proper operation.
To do so could result in inadequate or no braking
ability, which could cause personal injury, or
death, or property damage.
IMPORTANT: See the slack adjuster manufac-
turer’s service information and adjust the brakes
at the slack adjusters.
11. Remove the safety stands, lower the vehicle, and
remove the chocks from the tires.
12. In a safe area, drive the vehicle and check for
proper brake operation.
f422357 06/20/2002
1
2
3
4
1. Flanged Bolt
2. Leading Pin
3. Trailing Pin
4. Rubber Bushing
Fig. 9, ZOH-T Slide Pins and Bolts
Brakes
42
Saf-T-Liner C2 School Bus Maintenance Manual, November 2020
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