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6. In the cab at the brake valve, remove cap
screws and lockwashers securing the brake
valve assembly to the mounting structure.
7. Slide brake valve downward and remove from
cab.
8. Move brake valve assembly to a clean work
area for disassembly.
Installation
1. Move the brake valve assembly into position
and secure in place with cap screws and lock-
washers. Tighten cap screws to standard
torque.
2. Remove plugs from brake valve assembly and
hydraulic lines. Install fittings and connect lines
to brake valve assembly and tighten.
NOTE: Prior to checking the brake valve operation,
the steering system must have the proper nitrogen
precharge in the steering accumulators (refer to
Section
L,
"Hydraulic
accumulator precharge procedure). In addition, the
brake system lines must be bled of air and the brake
accumulators must also be precharged with nitrogen
(refer to brake accumulator precharge procedures,
this section).
3. If equipped, install electronic retard pedal to
brake pedal (Figure 3-3).
4. With the engine shut down and key switch OFF,
open both brake accumulator bleed down
valves. Precharge both accumulators.
J03034
System"
for
steering
Brake Circuit Component Service
NOTE:
For
best
performance,
accumulators in the temperature conditions the
vehicle is expected to operate in. During the
precharge, allow temperature of the nitrogen gas to
come into equilibrium with the ambient temperature.
5. Close both accumulator bleed down valves
after precharge is complete.
NOTE: To prevent excess oil from coming in contact
with the brake assemblies during the brake bleeding
procedure, attach a hose to the bleeder screw. Direct
the hose into a container.
6. Start the engine and bleed air from brake lines
and brakes. Actuate the brake lock switch and
open the uppermost bleeder screw on all rear
brake assemblies until a steady stream of oil
appears. Close bleeder screw.
7. Release the brake lock switch and bleed the
remaining front brakes in the same manner by
depressing the brake pedal. Check for fluid
leaks at the brake valve.
charge
the
J3-5
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