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