Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 243
As soon as the condition goes away, the Anti-Lock
Warning Light is turned off. Although a fault code
will be set in most cases.
BENDIX ABS SYSTEMS DIAGNOSTICS
Bendix Anti-Lock 6 Brake System Diagnostics, be-
yond basic mechanical diagnostics, covered earlier in
this section. Are accomplished by using the DRB II
scan tool. See testing procedures outlined in the Ben-
dix Anti-Lock 6 Diagnostics Manual for the 1992
M.Y. vehicles.
Please refer to the above mentioned manual for
any further electronic diagnostics and service proce-
dures that are required on the Bendix Anti-Lock 6
Brake System.
ON-CAR ABS BRAKE SYSTEM SERVICE
GENERAL SERVICE PRECAUTIONS
The following are general cautions which should be
observed when servicing the Anti-Lock brake system
and/or other vehicle systems. Failure to observe
these precautions may result in Anti-Lock Brake
System component damage.
If welding work is to be performed on the vehicle,
using an electric arc welder, the (CAB) connector
should be disconnected during the welding operation.
The (CAB) connector should never be connected or
disconnected with the ignition switch in the ON po-
sition.
Many components of the Anti-Lock Brake System
are not serviceable and must be replaced as an as-
sembly. Do not disassemble any component which is
not designed to be serviced.
CHECKING BRAKE FLUID LEVEL
CAUTION: Only use brake fluid conforming to DOT
3 specifications, such as Mopar or Equivalent. Do
not use any fluid which contains a petroleum base.
Do not use a container which has been used for pe-
troleum based fluids or a container which is wet
with water. Petroleum based fluids will cause swell-
ing and distortion of rubber parts in the hydraulic
brake system. Water will mix with brake fluid, low-
ering the fluid boiling point. Keep all brake fluid
containers capped to prevent contamination. Re-
move the front cap of the master cylinder reservoir
and fill to the bottom of the split ring.
For the specific procedure for the inspection of
brake fluid level and adding of brake to the reser-
voir. Refer to the Service Adjustments Section in this
group of the service manual.
BLEEDING BENDIX ANTI-LOCK 6 BRAKE
SYSTEM
The Anti-Lock Brake System must be bled anytime
air is permitted to enter the hydraulic system, due to
disconnection of brake lines, hoses of components.
If the Modulator Assembly is removed from the ve-
hicle, both the Base Brake System and the Anti-Lock
Brake System must be bled using the appropriate
procedures. It is important to note that excessive air
in the brake system will cause a soft or spongy feel-
ing brake pedal.
During bleeding operations, be sure that the brake
fluid level remains close to the FULL level in the
reservoir. Check the fluid level periodically during
the bleeding procedure and add DOT 3 brake fluid as
required.
The Bendix Anti-Lock 6 Brake System must be
bled as two independent braking systems. The non
ABS portion of the brake system is to be bled the
same as any non ABS system. Refer to the Service
Adjustments section in this manual for the proper
bleeding procedure to be used. This brake system can
be either pressure bled or manually bled.
The Anti-Lock portion of brake system MUST be
bled separately. This bleeding procedure requires the
use of the DRB II Diagnostic tester and the bleeding
sequence procedure outlined below.
ABS BLEEDING PROCEDURE (FIG. 1)
(1) Assemble and install all brake system compo-
nents on vehicle making sure all hydraulic fluid
lines are installed and properly torqued.
(2) Bleed the base brake system. Using the stan-
dard pressure or manual bleeding procedure as out-
lined in the Service Adjustments section of this
service manual.
To perform the bleeding procedure on the ABS
unit. The battery and acid shield must be removed
from the vehicle. Reconnect the vehicles battery, to
the vehicles positive and negative battery cables us-
ing jumper cables. This is necessary to allow access
to the 4 bleeder screws located on the top of the Mod-
ulator assembly.
(3) Connect the DRB II Diagnostics Tester to the
diagnostics connector. Located behind the Fuse Panel
access cover on the lower section of the dash panel to
the left of the steering column. (It is a blue 6 way
connector).
(4) Using the DRB II check to make sure the
(CAB) does not have any fault codes stored. If it does
remove them using the DRB II.
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ANTI-LOCK 6 BRAKE SYSTEM
Ä
WARNING: WHEN BLEEDING THE MODULATOR
ASSEMBLY WEAR SAFETY GLASSES. A CLEAR
BLEED
TUBE
MUST
BE
ATTACHED
TO
THE
BLEEDER SCREWS AND SUBMERGED IN A CLEAR
CONTAINER
FILLED
PART
WAY
WITH
CLEAN
BRAKE FLUID. DIRECT THE FLOW OF BRAKE
FLUID AWAY FROM THE PAINTED SURFACES OF
THE VEHICLE. BRAKE FLUID AT HIGH PRESSURE
MAY COME OUT OF THE BLEEDER SCREWS,
WHEN OPENED.
When bleeding the Modulator Assembly. The fol-
lowing bleeding sequence MUST be followed to in-
sure complete and adequate bleeding of the brakes
hydraulic system. The Modulator Assembly can be
bled using a Manual bleeding procedure or standard
Pressure Bleeding Equipment.
If the brake system is to be bled using pressure
bleeding equipment. Refer to Bleeding Brake System,
in the Service Adjustments section at the beginning
of this group, for proper equipment usage and proce-
dures.
MODULATOR ASSEMBLY BLEEDING
SEQUENCE
1 SECONDARY SUMP
(1) Put a bleeder tube on the Secondary Sump
bleeder screw (Fig. 1).
(2) Use a pressure bleeder, or have an assistant,
apply light and constant pressure on the brake pedal.
Loosen the Secondary Sump bleeder screw (Fig. 1).
(3) Using the DRB II select the Actuate Valves
test mode. Then actuate the LF Build/Decay Valve.
(4) Bleed the Secondary Sump. Until a clear air
free flow of brake fluid is evident in the clear hose
and no air bubbles appear in the container, or the
brake pedal bottoms.
(5) Tighten the bleeder screw and release the
brake pedal.
(6) Repeat steps 2 through 5 until a clear air free
flow of brake fluid is coming out of the Secondary
Sump bleeder screw.
(7) Next select and actuate the RR Build/Decay
Valve. Again repeat steps 2 through 5 until a clean
air free flow of brake fluid is coming out of the Sec-
ondary Sump bleeder screw.
2 PRIMARY SUMP
(1) Put a bleeder tube on the Primary Sump
bleeder screw (Fig. 1).
(2) Use a pressure bleeder, or have an assistant,
apply light and constant pressure on the brake pedal.
Loosen the Primary Sump bleeder screw (Fig. 1).
(3) Using the DRB II select the Actuate Valves
test mode. Then actuate the RF Build/Decay Valve.
(4) Bleed the Primary Sump. Until a clear air free
flow of brake fluid is evident in the clear hose and no
air bubbles appear in the container, or the brake
pedal bottoms.
(5) Tighten the bleeder screw and release the
brake pedal.
(6) Repeat steps 2 through 5 until a clear air free
flow of brake fluid is coming out of the Primary
Sump bleeder screw.
(7) Next select and actuate the LR Build/Decay
Valve. Again repeat steps 2 through 5 until a clean
air free flow of brake fluid is coming out of the Pri-
mary Sump bleeder screw.
3 PRIMARY ACCUMULATOR
(1) Put a bleeder tube on the Primary Accumulator
bleeder screw. (Fig. 1)
(2) Use a pressure bleeder, or have an assistant,
apply light and constant pressure on the brake pedal.
Loosen the Primary Accumulator bleeder screw (Fig.
1).
(3) Using the DRB II select the Actuate Valves
test mode. Then actuate the RF/LR Isolation Valve.
(4) Bleed the Primary Accumulator. Until a clear
air free flow of brake fluid is evident in the clear
hose and no air bubbles appear in the container, or
the brake pedal bottoms.
(5) Tighten the bleeder screw and release the
brake pedal.
Fig. 1 Bleeding ABS Modulator Assembly
Ä
ANTI-LOCK 6 BRAKE SYSTEM
5 - 127
(6) Repeat steps 2 through 5 until a clear air free
flow of brake fluid is coming out of the Primary Ac-
cumulator bleeder screw.
(7) Next select and actuate the RF Build/Decay
Valve. Again repeat steps 2 through 5 until a clean
air free flow of brake fluid is coming out of the Pri-
mary Accumulator bleeder screw.
4 SECONDARY ACCUMULATOR
(1) Put a bleeder tube on the Secondary Accumu-
lator bleeder screw. (Fig. 1)
(2) Use a pressure bleeder, or have an assistant,
apply light and constant pressure on the brake pedal.
Loosen the Secondary Accumulator bleeder screw
(Fig. 1).
(3) Using the DRB II select the Actuate Valves
test mode. Then actuate the LF/RR Isolation Valve.
(4) Bleed the Secondary Accumulator. Until a clear
air free flow of brake fluid is evident in the clear
hose and no air bubbles appear in the container, or
the brake pedal bottoms.
(5) Tighten the bleeder screw and release the
brake pedal.
(6) Repeat steps 2 through 5 until a clear air free
flow of brake fluid is coming out of the Secondary
Accumulator bleeder screw.
(7) Next select and actuate the LF Build/Decay
Valve. Again repeat steps 2 through 5 until a clean
air free flow of brake fluid is coming out of the Pri-
mary Accumulator bleeder screw.
PUMP/MOTOR SERVICE
On the Bendix Anti-Lock 6 Brake System the
Pump/Motor assembly can only be serviced as part of
Modulator Assembly.
MODULATOR ASSEMBLY (FIG. 2)
REMOVAL
(1) Center vehicle on hoist, or raise front of vehicle
on jack stands.
(2) Disconnect and remove the battery, battery
tray and acid shield covering the modulator assembly
(Fig. 2).
(3) Disconnect the delta (P) switch electrical con-
nector from the Modulator Assembly (Fig. 3). Re-
move the top Modulator Assembly bracket to fender
shield mounting bolt (Fig. 2).
(4) Disconnect the 2 master cylinder supply tubes
at the Modulator Assembly. Loosen the 2 tubes at
the Master Cylinder so the tubes can be swung out of
the way without kinking them (Fig. 4)
(5) Raise the vehicle on the hoist.
(6) From under the vehicle disconnect the Modula-
tor Assembly 10 way connector (Fig. 3). Remove the
4 remaining hydraulic brake tubes from the Modula-
tor Assembly.
(7) Remove Modulator Assembly bracket mounting
bolt closest to junction block.
(8) Loosen but do not fully remove bracket mount-
ing bolt nearest the radiator.
(9) Lower the vehicle, the Modulator Assembly and
bracket can now be lifted out of the vehicle (Fig. 1)
Fig. 2 Modulator Assembly
5 - 128
ANTI-LOCK 6 BRAKE SYSTEM
Ä
INSTALLATION
(1) Install the Modulator Assembly in the vehicle.
Use the protruding tab on the Modulator Assembly
to locate and hold the assembly in place in the vehi-
cle. Make sure the bracket is held by the front
mounting bolt.
(2) Install but do not tighten the Modulator As-
sembly bracket to fender shield attaching bolt.
(3) Raise the vehicle on the hoist. Install the Mod-
ulator Assembly bracket mounting bolt near the
Fig. 2 Modulator Assembly Removal
Fig. 3 Modulator Assembly Electrical Connections
Fig. 4 Brake Tube and Hose Routing at Modulator Assembly
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ANTI-LOCK 6 BRAKE SYSTEM
5 - 129
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