Isuzu N Series 2008 Owner's Manual page 411

WARNING
• The HBB system has been designed to use Besco ATF-III as the hydro-booster
fluid (DEXRON
fluid is used with this system, rubber components may be damaged, oil may leak
and the system may malfunction. It is important to remember that the fluid used
in the hydro-booster is completely different in characteristics from the brake fluid
used in the master and wheel cylinders.
• Keep brake fluid for the master and wheel cylinders away from hydro-booster
components. Likewise, keep hydro-booster fluid away from the master and
wheel cylinder components.
• If hydro-booster fluid and brake fluid from the master cylinder are mistakenly
mixed together and used, rubber components will deteriorate as a result of
insufficient lubrication. Any resultant oil leakage or system malfunction can in
turn lead to dragging brakes or other major brake problems. As such, mixing of
these two fluids can ultimately lead to vehicle fire or other serious accidents.
• When the pump operates while the engine is running, the fluid in the hydro-
booster will become hot. During normal braking, the temperature in piping and
within the hydro-booster can rise above 100°C (212°F). For this reason, special
care will be required when working with hydro-booster components. If the hydro-
booster is to be removed from the vehicle, shut off the engine and then allow at
least 30 minutes for it to cool down before beginning this operation.
• Even when the engine is stopped, the hydro-booster's accumulator will remain
in a highly-pressurized condition for a significant period of time. Before removing
the hydro-booster or piping from the vehicle, stop the engine and depress
the brake pedal at least 10 times in order to lower the accumulator pressure
to atmospheric pressure. This is of particular importance when removing
components such as the accumulator or pressure switch from the hydro-
booster. If these operations are attempted while the accumulator is still at a high
pressure, hydro-booster fluid may spray out.
CAUTION
• When bleeding the brake hydraulic system (including the master and wheel
cylinders) of a model with 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.
When bleeding both the hydro-booster and the brake hydraulic systems, start
with the hydro-booster system using Step 1 through Step 9 below.
2008N_sec07-2_print2.indd 65
SERVICE AND MAINTENANCE
Hydro-Booster Fluid
®
III fluids from different suppliers can also be used). If any other
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