The steering circuit can be isolated from the brake
circuit by removing the brake supply line from the
bleeddown manifold.
Plug the brake supply line and cap the port in the
bleeddown manifold. (see WARNING below)
Before disconnecting pressure lines, replacing
components in the hydraulic circuits, or installing
test gauges, ALWAYS bleed down hydraulic steer-
ing and brake accumulators.
Hydraulic fluid escaping under pressure can have
sufficient force to enter a person’s body by pene-
trating the skin and cause serious injury, and pos-
sibly death, if proper medical treatment by a
physician familiar with this type of injury is not
received immediately.
The steering accumulator can be bled down with en-
gine shut down, turning key switch “Off”, and waiting
90 seconds. Confirm the steering pressure is released
by turning the steering wheel - No front wheel move-
ment should occur. Open both bleed down valves on
brake manifold to bleed down all four brake accumu-
lators.
Before disabling brake circuit, be sure truck
wheels are blocked to prevent possible rollaway.
FIGURE 4-2. BRAKE MANIFOLD
J4-2 Brake Circuit Checkout J04025
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