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The pull rod is mounted to the primary shoe side by pin. The move of the pull rod is
transmitted to the secondary shoe side through push rod. (See Fig. 2-5)
Fig. 2-5 Parking brake
(3) Clearance self-adjusting mechanism
A proper clearance between the friction piece and the brake drum is maintained by
the clearance self-adjusting mechanism. (See Fig. 2-6)
Fig. 2-6 Clearance self-adjuster
The clearance self-adjusting mechanism actuates only when the truck in reverse
travel.
▲Operation of the clearance self-adjuster
When brake during travelling backward, the secondary brake shoe contact with main
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