Parking Brakes Control Valve; Water Heater Timer; Low Buoy Control Valve; Parking Brakes Override Valve - PREVOST H3-41 Manual

CONTROL VALVES

Parking Brakes Control Valve

Spring-loaded parking brakes are applied by
pulling up the control valve knob and protector
assembly. Lift safety cover and push down to
release brakes. Refer to ''Emergency and
Parking Brakes'' in
Features" chapter.(page 6-4).

Water Heater Timer

Use to program the start time of the optional
engine coolant heater. Refer to "Other Features"
(page 4-5) for additional information.
Low-Buoy Control Valve

LOW BUOY CONTROL VALVE

Rock back the control valve lever to lower the
vehicle by about four inches. Returning lever to
its normal (forward) position raises the vehicle
back to its normal ride height.
'Emergency Safety
3-5
CONTROLS & INSTRUMENTS

Parking Brakes Override Valve

SEAT
If the primary system air pressure drops below
40 psi (276 kPa) during normal operation, the
spring-loaded parking
immediately applied at full capacity on the drive
axle to stop the vehicle.
If this occurs, determine the correct cause of
pressure loss before proceeding.
The vehicle may be equipped with an optional
parking brake release system that can be used
to override the parking brakes so that the
vehicle can be driven for a short distance to a
safe parking area. To operate the optional
parking brake release, push and hold down the
control knob while driving.
DIAGNOSTIC DATA READER
(DDR) RECEPTACLE
To facilitate troubleshooting of the DDEC, WT
and ABS systems and to obtain data logged in
the ECM (Electronic Control Module) memory, a
Diagnostic Data Reader (DDR) (not supplied)
can be connected through the DDR receptacle.
A user's manual is supplied with the optional
DDR.
The DDR receptacle is located inside the
footwell, on the upper left side wall.
DRIVER'S
brakes will be