Volvo VNL 780 Operator's Manual page 250

240 OPERATION
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Check slack adjusters and chamber push rod travel. With brakes applied or released,
look for conspicuously different positions of the slack adjusters.
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Check spring brakes.
Step 14: Left Side of Trailer Area
Landing Gear or Dolly Area
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Fully raised; no missing or damaged parts.
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Crank handle present and secured.
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If power operated, no air/hydraulic leaks.
Spare Wheel(s)
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Spare wheel securely mounted in rack with no damage to rack.
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Tire and wheel condition adequate for a spare: proper size, properly inflated.
Lights and Reflectors
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Trailer side clearance lights: clean, operating and proper color.
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Reflectors clean and proper color.
Frame and Body
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Frame and crossmembers not bent, cracked, damaged or missing.
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Proper placarding.
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Body parts not damaged or missing.
Before Leaving the Parking Area
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Remove chocks from the wheels.
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Test trailer hook-up by slowly pulling while applying the trailer brakes with the trailer
brake hand control valve.
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Test the service brakes before leaving the parking area.
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Test parking brakes by stopping on a 20% grade and applying the parking brakes. The
parking brakes shall hold the combined vehicle and trailer without moving.