Specifications

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At the same time, the brake fluid in each operating cylinder is pressurized by the
return spring, returning into the master cylinder through the check valve. With the
piston in its original position, the brake fluid in the master cylinder flows into the
reserve tank through the return port. The brake fluid in the brake pipelines and
operating master has a residual pressure proportioned to the set pressure of the
check valve, which makes each operating cylinder piston cup securely seated to
prevent oil leakage and eliminates a possibility of air locking when the truck is sharply
braked. See Fig5.1.
Fig5.1 Master cylinder
1.
Link rod
6.
Piston
2.
Push rod
7.
Primary cup
3.
Dust cover
8.
Spring
4.
Snap ring
9.
Check valve
5.
Secondary cup
5.3 Wheel brake
The wheel brake is the internal expansion hydraulic type consisting of brake
shoes, spring, operating cylinder, adjuster and backing plates. Two wheel brakes are
provided on each end of the front axle. The brake shoe, one end of it being connected
to the anchor pin and the other to the adjuster, is stressed on the backing plate by the
spring and spring pull rod. The primary brake shoe is provided with the parking pull
rod while the secondary brake shoe with the adjusting lever of the clearance
self-adjuster. The structure of wheel brake refers to Fig5.2.