OTHER FEATURES
CHECK TRANS light on the dashboard, which
serves as a fault indicator.
To enhance troubleshooting and to allow
interrogation of the ECU for valuable service
information, the shift selector display or a
diagnostic tool (not supplied) can be used. For
information about reading and interpreting
diagnostic codes, refer to "Technical
Information" chapter 8 under "World
Transmission Diagnostic Codes".
TRANSMISSION RETARDER
The transmission retarder is an optional device
that helps to reduce the speed of a vehicle. It
improves vehicle control, increases driving
safety and permits more economical operation.
The retarder provides slowing power when it is
most needed, such as when descending
mountain roads, in stop-and-go traffic and on
crowded freeways.
The retarder is provided with a switch on the
dashboard and a lever on the steering column
(refer to "Controls & Instruments" chapter 3).
Note :
Extended use will raise the
transmission oil temperature.
The retarder helps to reduce speed on grades
without using the vehicle's conventional service
braking system. This virtually eliminates brake
overheating and reduces the risk of a runaway
vehicle. A retarder greatly increases the service
life of brake pads and discs, resulting in reduced
brake maintenance costs.
Note :
Each time the transmission retarder
system is in operation, the stoplights will
automatically illuminate.
Note :
For vehicles equipped with the
Antilock Braking System (ABS), as the wheels
start to lock-up on slippery roads, the output
retarder automatically deactivates until the
wheels roll freely.
JACOBS ENGINE BRAKE
The JACOBS engine brake is an optional diesel
engine retarder which uses engine compression
to aid in slowing and controlling the motorcoach.
When activated, (refer to "Controls &
Instruments" chapter 3) the JACOBS brake
alters the operation of the engine's exhaust
valves so that the engine works as a power-
absorbing air compressor. This provides a
retarding action to the wheels.
The engine brake is a vehicle-slowing device,
not a vehicle-stopping device. It is not a
substitute for the service braking system. The
motorcoach's service brakes must be used to
bring the motorcoach to a complete stop.
Effectiveness of the engine brake system will
vary according to the transmission range in use.
The engine brake system is more effective in
lower ranges and at higher engine speeds.
Warning :
When descending significant
grades, use service brakes as little as possible.
If engine does not slow vehicle to a safe speed,
apply service brakes and shift to a lower range.
Let the engine (and engine brake) slow the
motorcoach. Keep brakes cool and ready for
emergency stopping.
Note :
Each time the engine brake system is
in operation, the stoplights automatically
illuminate.
ANTI-LOCK BRAKING SYSTEM
The purpose of the Anti-lock Braking System
(ABS) is to maintain vehicle stability and control
during braking and to minimize the stopping
distance in any road condition.
On slippery roads and more generally in
emergency situations, over-braking frequently
induces wheel locking. Wheel locking greatly
increases breaking distance on any road
surface, impedes directional control and causes
severe tire abrasion. An anti-lock braking system
provides maximum braking performance while
maintaining adequate control on slippery roads.
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