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Figure 49 Brake pressure relief valve in
high-pressure oil rail
1.
Front of engine
2.
Brake pressure relief valve
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
1 ENGINE SYSTEMS
The ECM removes the power source from the
brake shut-off valve to deactivate the engine brake.
Residual brake gallery pressure initially bleeds from
the actuator bore.
bleeds down to 6895 kPa (1000 psi), the brake
pressure relief valve opens, and oil drains back to
sump.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
When brake gallery pressure
57
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