NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M140 Tow Tractor Manual No. 46054
PAGE 2-6
CHAPTER 2 MAINTENANCE
2 TROUBLESHOOTING
AUGUST 31, 2008
BRAKE SYSTEM TROUBLESHOOTING (CONTINUED)
PROBLEM POSSIBLE CAUSE CORRECTION
Hard Pedal
(Excessive
Foot
Pressure
Required)
Incorrect rear brake lining. Install proper lining
Lining contaminated with
Replace or reline shoes. Repair
Shoes not centered. Center shoes.
Primary and secondary shoes
reversed
Install shoes in correct location.
Brake linkage binding Free linkage and lubricate.
Master or wheel cylinder
pistons frozen
Rebuild or replace cylinder.
Seized caliper pistons. Repair or replace.
Linings hard and glazed. Sand lining with medium grit
sandpaper.
Lining ground to wrong radius. Grind to correct radius.
Heat checked or blued rotor. Recondition or replace rotor.
Brake line or hose clogged or
kinked
Replace line or hose.
Power booster unit defective Replace power booster.
Power steering pump belt
defective or slipping.
Replace belt or tighten
steering pump reservoir.
Brakes Pull
Tractor to
One Side
One wheel grabbing. See “Brakes Grab”
Shoes not centered or
adjusted properly
Center and adjust lining-to-drum
clearance.
shoes reversed on one side.
Replace lining or install shoes in
proper position.
Sagged, weak, or broken
suspension.
Repair or replace axle.
Uneven tire pressure. Use same pressure on both sides.
Front axle damaged. Repair or replace axle.
Plugged line or hose. Clean or replace.
Caliper or backing plate loose. Tighten fasteners to proper torque
specs
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