Isuzu N Series - When the Warning Light Comes On

8-21
IN CASE OF EMERGENCY
Brake Booster Warning Light
HB
When the Warning Light Comes On
The warning buzzer will sound whenever
the brake booster's vacuum becomes
insufficient either with the starter switch
in the "ON" position or during driving,
whenever the hydraulic brake booster
(HBB) system becomes faulty, or whenever
a problem occurs with the exhaust brake
while it is being used, if your vehicle is
equipped with an exhaust brake. The brake
booster warning light will also come on.
CAUTION
If your vehicle is equipped with an exhaust brake, and the warning buzzer
should sound during usage of the exhaust brake, immediately park the vehicle
in a safe place and take the following action:
With the engine still running, turn off the exhaust brake switch. A problem
in the exhaust brake system will be confirmed if the buzzer stops sounding
several seconds later. Have your vehicle inspected by the nearest Isuzu
Dealer.
If the warning buzzer continues to sound, the problem will be in the brake
booster for the foot (main) brake. Have your vehicle inspected by the nearest
Isuzu Dealer immediately.
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