(1) Start engine and build air pressure
to 125 ±4 psi (861 ±28 kPa)
(2) Turn OFF ENGINE switch.
(3) Release PARKING BRAKE.
(4) Check fittings and air lines 2611,
2612, 2622 and 2638 for crimping
and/or leaks (see schematic Fig 2-45).
(a) If there are crimps or leaks,
replace air lines and/or
(b) If there are no leaks, air lines and
fittings are OK.
Wear safety goggles when performing leakage tests on valves. Failure to do so may result in serious eye injury
due to high pressure air.
Truck must be on level ground and wheels must be chocked before parking brake is released. Otherwise, truck
may roll and cause injury to personnel.