Chrysler Concorde 2004 Service Manual page 1532

5 - 66 BRAKES - ANTILOCK BRAKE SYSTEM
BRAKES - ANTILOCK BRAKE SYSTEM (Continued)
(4) Bleed the base brake system using the stan-
dard pressure or manual bleeding procedure. (Refer
to 5 - BRAKES - BASE - STANDARD PROCEDURE)
(5) Using the DRBIII ,
BRAKES, followed by MISCELLANEOUS, then
BLEED BRAKES. Follow the instructions displayed.
When the scan tool displays TEST COMPLETED,
disconnect the scan tool and proceed.
(6) Bleed the base brake system a second time.
Check brake fluid level in the reservoir periodically
to prevent emptying, causing air to enter the hydrau-
lic system.
(7) Fill the master cylinder reservoir to the full
level.
(8) Test drive the vehicle to be sure the brakes are
operating correctly and that the brake pedal does not
feel spongy.
SPECIFICATIONS
ABS FASTENER TORQUE
DESCRIPTION
Brake Tubes
CAB To HCU Mounting
Screws
ICU Mounting Screws
Wheel Speed Sensor Head
Mounting Bolt
TONE WHEEL RUNOUT
DESCRIPTION
Front Tone Wheel
Maximum Runout
Rear Tone Wheel
Maximum Runout
WHEEL SPEED SENSOR AIR GAP
DESCRIPTION
Front Sensor
Rear Sensor
select ANTILOCK
Ft. In.
N·m
Lbs. Lbs.
17 12 145
2 — 17
11 — 97
7 — 60
SPECIFICATION
0.15 mm (0.006 in.)
0.15 mm (0.006 in.)
SPECIFICATION
0.42 – 1.71 mm
0.017 – 0.067 in.
0.38 – 1.31 mm
0.015 – 0.052 in.
FRONT WHEEL SPEED
SENSOR
DESCRIPTION
This system uses two-wire wheel speed sensors
known as active wheel speed sensors. One wheel
speed sensor (WSS) and one tone wheel is located at
each front and rear wheel. Each front wheel speed
sensor is attached to a boss in the steering knuckle
(Fig. 2). The front tone wheel is part of the outboard
constant velocity joint.
Fig. 2 Front Wheel Speed Sensor
1 - WHEEL SPEED SENSOR
2 - CV BOOT
3 - TONE WHEEL
4 - ROTOR
OPERATION
The CAB sends 12 volts to power an Integrated
Circuit (IC) in the sensor. The IC supplies a constant
7 mA power supply to the CAB. The relationship of
the tooth on the tone wheel to the permanent magnet
in the sensor, signals the IC to enable a second 7 mA
power supply. The output of the sensor, sent to the
CAB, is a DC voltage signal with changing voltage
and current levels. The ground for the IC and the
current sense circuit is provided by the CAB.
When a valley of the tone wheel is aligned with the
sensor, the voltage signal is approximately 0.8 volts
and a constant 7 mA current is sent to the CAB. As
the tone wheel rotates, the tooth shifts the magnetic
field and the IC enables a second 7 mA current
source. The CAB senses a voltage signal of approxi-
mately 1.6 volts and 14 mA. The CAB measures the
amperage of the digital signal for each wheel. The
resulting signal is interpreted by the ABS CAB as
the wheel speed.
LH