Volvo VNM Manuel de l'opérateur télécharger pdf (Page 317)

310 Brakes

Volvo Exhaust Brake

VN, VHD

The exhaust brake is standard on the Volvo

D12D engine. It is used to reduce wear on

the brake linings. The exhaust brake is most

effective at high engine speeds (1500 to 2300

rpm). The exhaust brake is automatically

disengaged if the engine speed drops to or

below 1100 rpm.

The exhaust brake works by containing

the exhaust gases in the exhaust manifold,

thereby making the engine work against the

back pressure. This provides a retarding

force on the drive wheels.

The following must be in effect for the

exhaust brake to function:

•

The switch is ON (down position)

•

Accelerator and clutch pedals are fully

released

•

Engine speed exceeds 1150 rpm

When the cruise control is engaged, the

exhaust brake automatically engages if

the selected cruise speed is exceeded by

approximately 5 mph (8 km/h). The exhaust

brake is then disengaged when the speed has

returned to approximately 3 mph (5 km/h)

above selected cruise speed.

Note: For both exhaust and engine brakes,

use a “one gear” driving strategy when

going downhill to keep engine speed up for

effective braking (for example: uphill in 7th

gear and downhill in 6th).

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