108
Instruments and Controls
Several types of engine brakes can be in-
stalled or are standard on certain engines.
All are used to reduce wear on the vehicle
brake linings.
Exhaust Brake, Volvo Engine
The exhaust brake is standard equipment on
the Volvo engine. It provides braking effect
to the rear wheels by trapping the exhaust
in the engine. The switch for exhaust brake
has two positions: ON and OFF.
The exhaust brake is most effective at high
engine speed (1,500 to 2,300 r/min). For
proper operation, see page 289.
W3001324
Engine Brake, Volvo Engine — Optional
The Volvo Engine Brake (VEB) is a com-
pression brake. It works together with the
exhaust brake to provide two levels of
braking power. The switch has three posi-
tions: OFF, LOW and HIGH. With the
switch in position LOW, only the exhaust
brake is engaged. With the switch in posi-
tion HIGH, both the exhaust brake and
compression brake are activated. For proper
operation, see page 290.
W3002303
Jake Brake or C–Brake — Optional
These engine brakes are similar in opera-
tion and are compression brakes. Three
power levels are available by engaging 2, 4,
or 6 cylinders in the braking (for Cummins
M11, only two power levels are available).
The left of the two switches is the ON/OFF
switch. The right switch is for selecting the
amount of braking power with positions
LOW, MED. and HIGH (for Cummins
M11, only LOW and HIGH). For proper
operation, see page 291.
W3002303
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