52
Switch for exhaust brake
Braking
with retarder.
Braking with
both retarder and
wheel brakes.
Driving
Exhaust brake (option)
The exhaust brake is a complement to the wheel braking
system. It is activated with a foot switch. The exhaust brake
is included in the engine exhaust pressure regulator.
Activating:
– release the accelerator
– then press down the foot switch
Exhaust braking will cease when the foot switch is released.
The exhaust brake is most effective at high engine speeds
but never activate it when the tachometer needle is in the
red.
Retarder
A retarder is optional on a manual gearbox. It is standard
equipment in automatic transmissions (integrated).
The retarder, like the exhaust brake, is a complement to the
ordinary braking system. Correctly used, they will increase
the service life of the brake linings many times over.
Therefore, always use these auxiliary systems first when
braking the bus.
To utilize the advantages of the retarder for smooth braking,
the brake pedal must not be pressed farther than that the
retarder is just engaged, i.e. 1–3 cm.
Some versions of retarder can also be activated with a hand
control. See further in the text.
The retarder has no braking effect when the wheels are sta-
tionary or rotating slowly. It can therefore not be used as a
parking brake or to lock the wheels.
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