Isuzu N Series 2008 Owner's Manual page 407

Bleeding the Brake Hydraulic System
If air is present in the brake hydraulic system, it adversely affects brake operations.
Bleed the system if the brakes are used when the quantity of the brake fluid in the tank
is extremely low or the brake piping is removed during maintenance operation. Do
not perform bleeding by yourself; it should be done with the help of another person. If
the brake system is equipped with an LSPV, bleed air from the LSPV in addition to the
front and rear brakes.
WARNING
• Before bleeding the brake system, be sure to park the vehicle on flat, level
ground and apply chocks to the wheels.
• Since the brake fluid readily absorbs moisture, ensure that moisture does not
enter the fluid while checking, adding or storing it. If moisture enters the fluid,
the boiling point of the fluid decreases and this causes "vapor lock", a highly
dangerous problem that affects brakes' functionality.
• Do not allow engine oil, gear oil and any other oils to mix with the brake fluid.
Brake fluid contaminated with such oils degrades the brakes' functionality and
damages the brake system components, possibly causing a very dangerous
situation.
CAUTION
• Brake fluid melts paintwork and vehicle component materials such as plastic,
vinyl and rubber. It is also highly corrosive on metals. If it is spilled, wipe it off
the affected surface immediately and thoroughly wash the surface with water.
• When bleeding the brake hydraulic system (including the master and wheel
cylinders) of a model with hydraulic brake booster (HBB), always start with
bleeding of the hydro-booster system. Next, bleed the brake hydraulic system
with the engine running. It is not possible to remove all the air while the engine
is stopped.
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