Volvo VNM Manuel de l'opérateur télécharger pdf (Page 301)

294 Brakes

Both circuits are piped into a dual brake

valve, which simultaneously applies front

and rear axle service brakes during each

brake application. In the event of a failure

in either one of the circuits, the other circuit

becomes the emergency circuit for applying

the brakes.

W5001486

DANGER

The Master Warning Telltale and buzzer

alerts of a dangerous situation. Air

pressure is low and the remaining air

volume may not be enough for repeated

braking. Failure to heed this warning can

result in loss of braking control, vehicle

accident and injury or death.

An important feature of the brake system is

that an automatic spring brake application

does not take place as a result of an air loss

in only one of the two circuits. In this case,

brake control remains in the foot brake valve.

In each air pressure gauge, there is a warning

light connected to a low pressure switch

that comes on if air pressure goes below 60

psi (420 kPa). At the same time, the buzzer

will sound and the main warning telltale

will come on. This pressure drop warns the

operator to make a manual emergency stop

before an automatic emergency stop takes

place.

W3005171

Master Warning Telltale

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