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2012 Trip
WARNING:
Brake lining may contain asbestos
material and should only be serviced
by qualified service technicians
who are trained in the appropriate
precautionary procedures. If any loss
of braking effectiveness or abnormal
braking indications are noticed, the
brakes and slack adjusters should
be inspected by a qualified brake
technician.
WARNING:
Do not manually adjust the slack
adjusters. If any loss of braking
effectiveness or abnormal braking
indications are noticed, the brakes and
slack adjusters should be inspected
by a qualified brake technician.
Automatic slack adjusters are not
designed to be manually adjusted.
Brake Systems - Backup
The motorhome air braking system is
equipped with backup safety systems
and warning alarms in the event of air
system failure. For example: should the air
compressor fail to charge the air system and
low air gauge readings go undetected, a low
air pressure buzzer will sound and a low air
pressure dash light will flash. These warning
indicators occur at approximately 65 psi to
alert the operator of an impending situation. If
the motorhome is allowed continued operation,
the pneumatic emergency spring brake relay
valve installed in the air system senses the low
air pressure condition and will release the air
charge from the spring brake air chambers on
the rear drive axle. In this case, the park brakes
will automatically apply at approximately
30 psi. This safety backup system acts as an
automatic emergency brake system.
Another backup safety is the air system
separation of the front and rear brakes,
implemented by using two air tanks. One tank
is located in the front and the other is located
in the rear. This separation allows the front air
tank to operate the front brakes; the rear tank
operates the rear drive axle brakes. This tank
division gives reassurance in case one tank
experiences a failure of an accessory air item
allowing the compressed air to escape.
Accessory air items are other pneumatically
operated items such as the air horn, vacuum
generator, etc. The accessory air items operate
only when air tank pressures exceed 65 psi.
This is done with pressure protection valves.
Should an accessory air item fail, the pressure
protection valve (PPV) reserves the remaining
air pressure of 65 psi for braking. This will
leave the motorhome with one air tank fully
charged for safety backup.
The rear air tank also has a safety backup -
the safety inversion valve. The inversion valve
senses the absence of rear air tank pressure.
In this case the inversion valve will allow the
operator to make a modulated spring brake
application in conjunction with the emergency
spring brake relay valve. The inversion valve
allows the front air tank pressure to recharge
the rear brake chambers after the modulated
spring brake application is made. This backup
system implements use of all the brakes,
allowing the operator to bring the motorhome
to a safe stop. In case of all compressed air
charge escaping from the front air tank, the
operator will still have full use of the rear
brakes.
aBS/atc SyStem (antI-lock BrakeS)
The motorhome is equipped with an anti-
lock braking system (ABS) and automatic
traction control system (ATC). The ABS
system monitors wheel rotation speeds by
using a 100-tooth magnetic tone ring mounted
to the hub. Revolving with the wheel, the
magnetic tone ring is polarized giving positive
and negative pulsations. A stationary sensor is
mounted adjacent to the tone ring to monitor
magnetic pulses. The pulses are monitored by
the ABS electronic control unit (ECU).
The ECU monitors all wheel sensors at
the rate of 100 times per second. The ECU
controls Pressure Modulator Valves. Pressure
Modulator Valves have two electric-over-air
solenoids, a hold solenoid and a release
solenoid. The modulator valves are open under
normal braking, allowing a straight through
air signal from the treadle valve to the brake
chamber. Should a wheel lose traction under
a braking application, the ECU will energize
the hold solenoid of the Pressure Modulator
Valve to interrupt the air signal from the
treadle valve to the brake chamber. The release
solenoid vents the existing air signal at the
brake chamber to the atmosphere, allowing
the skidding tire to regain traction. Skidding
tires have less tractive efficiency. It is possible,
under certain conditions, to have the wheel(s)
skid with a normal functioning ABS system.
The ABS itself does not apply additional
braking power. The purpose of the ABS is
to limit wheel lock and decrease stopping
distance. Cautious driving practices and
maintaining adequate safe distance when
following vehicles is the key to safe vehicle
operation.
Содержание Trip 2012
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Страница 138: ...133 W ater Sy stems 6 2012 Trip Water System Diagram 040487va...
Страница 139: ...134 Wat er Sy stems 6 2012 Trip Notes...
Страница 151: ...146 Pro p ane Sy tems 7 2012 Trip Notes...
Страница 173: ...168 Ho us e Electr ical 8 2012 Trip Notes...
Страница 190: ...185 Chassis Electrical 9 2012 Trip Engine No Start Flow Chart...
Страница 191: ...186 Ch as s is Electr ical 9 2012 Trip Notes...
Страница 237: ...232 Ch assis 10 2012 Trip Notes...