13. Remove bottom shoe spring (item 12) and adjusting bolt assembly (items 13-15).
14. Remove the two trailing shoe hold-down clips (item 10). Lift and rotate the clip until
released from hold-down pin.
15. Remove anchor pins (item 8) from holes.
16. If removal of the wheel cylinder or backing plate is necessary, place a clean pan
under brake assembly. Disconnect hydraulic line and cap the ends to prevent
system contamination.
17. If necessary, remove wheel cylinder attaching capscrews and wheel cylinder.
18. Clean and inspect the brake assembly according to paragraph 1.5.2.
NOTE: Disassembly of the brake is the same whether it is mounted on the vehicle or is on
a bench.
1.5.2 Cleaning and Inspection
Refer to Chapter 2.
1.5.3 Adjustment.
The rear brake is self-adjusting. As long as brake components are maintained as directed
in paragraph 1.5.2, normal vehicle operation is sufficient to keep the rear brakes properly
adjusted.
However, following overhaul or when new linings are installed, the brakes must be
manually adjusted to locate the curvature of the lining to the drum and obtain the proper
clearance. To adjust the rear brakes manually:
1. If not already done, 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 the rubber plug covering the adjustment slot, see parts illustration in
Chapter 4, on the backing plate. The slot is located about two inches from the
bottom edge of the backing plate. (There are actually two slots. Use the slot that is
toward the front of the vehicle).
3. Insert an adjusting tool through the adjustment slot to engage the star wheel on the
adjustment bolt, item 14, see parts illustration in Chapter 4. To move the shoes
closer to the brake drum, move the tool handle down.
To move the shoes away from the drum, rotate the tool handle up while keeping the
adjuster spring pushed away from the star wheel.
CHAPTER 3 OVERHAUL AUGUST 31, 2008
1 GENERAL REPAIR PAGE 7
M140 Tow Tractor Manual No. 46054
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