Operation
To release the parking brake after a low-pressure occurrence,
recharge system to at least 70 psi (483 kPa) and push in the
parking brake control. If the system cannot be recharged and
the vehicle must be moved, the spring brake must be manually
released (caged).
WARNING
To prevent property damage, personal injury, or
death:
•
Always install wheel chocks when manually
releasing the parking brakes, or the vehicle can
roll.
•
For towing, make sure the vehicle is securely
connected to tow vehicle and tow vehicle
parking brakes are applied before releasing the
disabled vehicle’s parking brakes.
•
To ensure release of parking brake, always cage
the spring in the brake chamber.
•
Under no circumstances should the spring
brake chamber be disassembled for the purpose
of releasing the parking brake.
In the event it is necessary to move the vehicle after an
emergency application (before air pressure can be restored),
the parking spring can be compressed mechanically to release
the brake. A release stud spring caging tool is furnished with
the brake chamber assembly. The release stud engages in the
spring pressure plate and its nut is tightened to compress, cage
the spring, and release the brake.
Remove release stud assembly from carrying pocket.
Apply a light coat of antiseize to the threads of the release stud to
avoid any unnecessary wear of the threads. Remove the access
plug from the end of the spring chamber. Insert the release stud
through the opening in the chamber and into the spring pressure
plate.
Turn the release stud one-quarter turn to engage the tangs on
the release stud into the slot in the pressure plate. Install the nut
on the release stud. Be sure tang on release stud stays engaged
with slot on pressure plate while installing the nut. Tighten the
nut with a wrench to compress the spring.
Parking Brake Reset
Charge spring brake chambers with air pressure. Loosen nut
and remove the release stud and nut from the spring housing and
reinstall the access plug in the chamber opening. Reinstall the
release stud and nut in the carrying pocket on the brake chamber
housing.
Parking Brake Alarm
If the parking brake alarm sounds
(horn continuously blows
when driver’s door is opened),
press the service brake pedal.
Then, after turning the ignition switch to the ON or ACC position,
make sure that the parking brake is set. For a more detailed
description of the alarm, see the
Parking Brake Alarm
in the
Electrical
section above.
185
Summary of Contents for ProStar+
Page 4: ......
Page 24: ...Foreword 12...
Page 38: ...Model Description 26...
Page 74: ...Controls Features Declination Zone Map 62...
Page 98: ...Controls Features Center Dash Panel Wing Panel 86...
Page 118: ...Controls Features 106...
Page 243: ...Maintenance Instructions 231...
Page 286: ...Maintenance Intervals and Specifications 274...
