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Volvo VN - Parking Brake;Trailer Supply Valves

Volvo VN
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282OPERATION
ParkingBrake/TrailerSupplyValves
Trucks/Tractorsmayhavetwoaircontrolvalvesontheinstrumentpanel:
TrailerSupply(redoctagonalknob)
SystemPark(yellowdiamondknob)
W5001116
TheSystemParkvalveknob(yellow)shouldbepushedinrst,aftersufcientair
pressureisbuiltup(applyfootbraketopreventvehiclefromrolling).TheTrailerAir
Supplyvalveknobmaythenbepushedin.
TheTrailerAirSupplyvalveknobandSystemParkvalveknobwillautomatically
popoutifthesystempressure(bothfrontandrearcircuits)dropsto170to240kPa
(25to35psi).Thetractorprotectionvalvewillthenclose,thetractorspringbrakes
willapplyandthetraileremergencysystemwillbeactivated.

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