207
Section 10 — cHaSSiS information
camelot 2007
This backup system implements use of all
the brakes, allowing the operator to bring
the motorhome 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.
WARNING
The ABS/ATC system is designed to
increase tire to road surface traction but
cannot overcome naturally occurring
laws of physics. The ABS/ATC system,
combined with safe driving practices,
will reduce the possibility of wheel skid
and loss of lateral stability.
ABS Component Function:
Speed sensors and tone rings on each
wheel monitor
wheel rotation.
Each speed sensor
communicates
wheel rotation
pulses to the
Electronic Control
Unit.
The ECU receives
the speed sensor
signal pulses to
calculate speed
and acceleration
rates of each wheel.
Based on the speed sensor input, the
ECU detects impending wheel lock
and operates the ABS Modulator
Valves required for proper control. The
Modulator Valves are operated in the Air,
Release or Hold modes to regulate air
pressure to the brake chambers.
Braking force is applied at a level which
minimizes the stopping distance while
maintaining as much lateral stability as
possible.
ABS Warning Light:
The ABS will perform a dash indicator lamp
check and self-diagnostic test each time the
ignition is switched to the on position.
When the ignition is turned on, the ABS
indicator illuminates momentarily (3
seconds) verifying the self-diagnostic
test. If the ABS indicator light remains
on, or illuminates while the motorhome
is being operated, this indicates a fault
in the anti-lock brake system. This fault
will not affect normal service braking.
The motorhome will need to go to a
service center to repair the problem.
INFORMATION
If a fault code occurs, call a Bendix
service locator at 1-800-247-2725 and
take the motorhome to the nearest
repair facility.
ABS Diagnostic
If the ABS light on the dash comes on it
indicates that a fault has occurred with the Anti-
lock Brake System only. Normal braking is not
affected but the motorhome will need to go to
a service center. The service center can use one
of two methods to retrieve ABS diagnostic fault
codes.
090307
Summary of Contents for Camelot 2007
Page 16: ......
Page 18: ......
Page 49: ...45 Section 2 Driving Safety Camelot 2007 Weight Record Sheet Actual Worksheet 020255b...
Page 53: ...49 Section 2 Driving Safety Camelot 2007 Weighing Procedure Worksheet 020255c...
Page 106: ...appliances 4 102 Camelot 2007 Notes...
Page 140: ...Section 5 Equipment 136 camelot 2007 Notes...
Page 155: ...151 Section 6 water systems camelot 2007 Water service center Typical Water System...
Page 156: ...Section 6 water systems 152 camelot 2007 Notes...
Page 186: ...Section 8 Electrical Systems House 182 camelot 2007 Notes...
Page 202: ...Section 9 Electrical Systems Chassis 198 camelot 2007 engine no start flow chart...
Page 244: ...Section 10 chassis information 240 camelot 2007 42 Tag Axle Models 070171i 070171j...
Page 258: ......
