premature rotor wear. Do this in assembly with the rotor while applying pressure to
the caliper to prevent the mounting bolts from bending. To insure that the caliper
floats check for adequate grease in the caliper mounting sleeves, we recommend
Stalube #3303 synthetic brake caliper grease with added graphite and teflon.
9. Reassemble brake caliper to caliper bracket. Insert caliper pins with blue Loctite.
Tighten caliper pins to 35-40 ft-lbs torque.
10. Check that the caliper and pads are centered over (parallel to) the disc.
11. Install wheel assembly. Tighten lug nuts per Chapter 2-4.2.6. Remove safety
stands and lower tractor.
After initially mounting wheel and tire assembly, recheck lug nut
torque after the first hour of operation and after the first 8 hours of operation. After
this, check monthly or every 250 hours, whichever comes first. Do not lube wheel
studs as it will result in inaccurate tightening torque. Failure to follow these
procedures could result in wheel mounting failure and loss of vehicle control.
12. If air was allowed to enter the hydraulic system, bleed brakes according to
2-1.10.
13. Pump brake pedal to force pads against disc. Check fluid reservoir and bring to
correct level.
14. Road test the tractor to test brake action. The tractor should stop quickly and
smoothly with no tendency to dive or pull to one side.
1.4.2 Disc Replacement (Front)
Refer to 1.4.3
Inspect disc according to 2-1.6.5.
1.4.3 Caliper Repair (Front)
Figure 1
Removal
1. Using a jack, raise tractor high enough off floor to provide adequate working
space underneath the frame. Support tractor with safety stands. Be sure that
positioning of safety stands does not interfere with work task.
2. Remove front wheel.
3. Remove brake line from caliper and plug line end to prevent entry of
contaminants. Some brake fluid will spill from line when removing.
CHAPTER 3 OVERHAUL AUGUST 31, 2008
1 GENERAL REPAIR PAGE 5
M100 Tow Tractor Manual No. 46052
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