Chrysler Stratus Convertible. Manual — part 207
PROPORTIONING VALVE
NOTE: The following procedure is for the diagnosis
and testing of the proportioning valve(s) on a vehi-
cle equipped with ABS. For diagnosis and testing of
proportioning valves on a vehicle without ABS,
Refer to the BASE BRAKE SYSTEM section in this
group.
If a condition of premature rear wheel skid occurs
on a vehicle, the proportioning valve should always
be tested prior to it being replaced. This is due to the
fact that there are conditions other then a faulty pro-
portioning valve which can cause a premature rear
wheel skid.
One proportioning valve controls the right rear
brake, and the other proportioning valve controls the
left rear brake (Fig. 17). Therefore, a road test to
determine which rear brake slides first is essential.
Once the wheel which is skidding first is determined,
use the following procedure to diagnose the propor-
tioning valve.
The test procedure is the same for both rear wheel
proportioning valves. After road testing vehicle to
determine which wheel skids first, follow the proce-
dure below for testing the required proportioning
valve.
(1) Remove the cover (Fig. 18) securing the chassis
brake tubes and the fuel lines to the vehicle floor
pan.
(2) Remove the chassis brake tubes (Fig. 17) from
the proportioning valve controlling the rear wheel of
the vehicle which has premature wheel skid.
(3) Remove the proportioning valve from the rear
brake chassis tube.
(4) Remove the routing clips for the chassis brake
tubes and fuel lines from the floor pan.
CAUTION: The
chassis
brake
tube
must
be
removed from the routing clips. This is to prevent
the chassis brake tube from having to be bent when
installing the proportioning valve with the pressure
test fittings.
(5) Remove the chassis brake tube that requires
testing of its proportioning valve from the routing
clips.
CAUTION: Be sure the pressure test fittings being
installed into the proportioning valve have the cor-
rect thread sizes and flares for installation into the
proportioning valve and for installation of the chas-
sis brake tubes.
Fig. 17 Proportioning Valve Location
1 – CHASSIS BRAKE TUBES
2 – RIGHT REAR BRAKE PROPORTIONING VALVE
3 – RIGHT FRAME RAIL
4 – LEFT REAR BRAKE PROPORTIONING VALVE
5 – CHASSIS BRAKE TUBES
6 – FUEL TUBES
Fig. 18 Tube Bundle Cover
1 – STABILIZER BAR
2 – MOUNTING BOLTS
3 – FLOOR PAN
4 – TUBE BUNDLE
5 – COVER
6 – MOUNTING BOLT
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BRAKES
5 - 91
DIAGNOSIS AND TESTING (Continued)
(6) Install Pressure Test Fitting, Special Tool
6833-1 in the inlet port of the proportioning valve
(Fig. 19). Install Pressure Test Fitting, Special Tool
8187–2 in the outlet port of the proportioning valve
(Fig. 19). Tighten tube nuts to a torque of 17 N·m
(145 in. lbs.)
(7) Install the proportioning valve with the pres-
sure test fittings installed, in the chassis brake tube
(Fig. 20). Tighten both tube nuts to a torque of 17
N·m (145 in. lbs.).
(8) Install
a
Pressure
Gauge,
Special
Tool
C-4007-A into each pressure test fitting (Fig. 21).
Bleed air out of hose from pressure test fitting to
pressure gauge, at pressure gauge to remove all
trapped air.
(9) With the aid of a helper, apply pressure to the
brake pedal until reading on proportioning valve
inlet gauge, is at the pressure shown on the following
chart, PROPORTIONING VALVE APPLICATIONS
AND PRESSURE SPECIFICATIONS. Then check
the pressure reading on the proportioning valve out-
let gauge. If proportioning valve outlet pressure does
not agree with value shown on the following chart,
when inlet pressure shown on chart is obtained,
replace the proportioning valve. If proportioning
valve is within pressure specifications do not replace
proportioning valve.
(10) Check rear wheel brake shoe linings for con-
tamination or for replacement brake shoes not meet-
ing OEM brake lining material specifications. These
conditions can also be a possible cause for a prema-
ture rear wheel skid.
(11) Install proportioning valve on end of brake
flex hose. Tighten the proportioning valve to a torque
of 17 N·m (145 in. lbs.).
(12) Install brake tube on proportioning valve.
Torque tube nut to 17 N·m (145 in. lbs.) torque.
(13) Bleed the affected brake line. Refer to BASE
BRAKE
BLEEDING
in
the
SERVICE
PROCE-
DURES section.
Fig. 19 Pressure Test Fittings Installed On
Proportioning Valve
1 – SPECIAL TOOL 8187–2
2 – SPECIAL TOOL 6833–1
3 – PROPORTIONING VALVE
Fig. 20 Proportioning Valve With Pressure Test
Fittings Installed
1 – CHASSIS BRAKE TUBE FROM HCU
2 – PROPORTIONING VALVE
3 – CHASSIS BRAKE TUBE TO REAR BRAKE
4 – SPECIAL TOOL 8187–2
5 – SPECIAL TOOL 6833–1
Fig. 21 Pressure Gauges Installed On Pressure Test
Fittings
1 – PRESSURE TEST FITTING
2 – SPECIAL TOOL C-4007–A
3 – BLEED AIR FROM BOTH PRESSURE GAUGES HERE
4 – PRESSURE TEST FITTING
5 - 92
BRAKES
JX
DIAGNOSIS AND TESTING (Continued)
PROPORTIONING VALVE APPLICATIONS AND PRESSURE SPECIFICATIONS
Sales
Code
Brake System Type
Split Point
Slope
Identification
Inlet
Pressure
Outlet Pressure
BRA
14” Disc/Drum
600 psi
0.59
Bar Code
Label
1000 psi
800-900 psi
BRJ
14” Disc/Drum
W/ABS
600 psi
0.59
Bar Code
Label
1000 psi
800-900 psi
BRF
14” Disc/Disc W/ABS
500 psi
0.43
Bar Code
Label
1000 psi
600-700 psi
BRAKE FLUID CONTAMINATION
Indications of fluid contamination are swollen or
deteriorated rubber parts. Swelling indicates the
presence of petroleum in the brake fluid.
To test for contamination, put a small amount of
drained brake fluid in clear glass jar. If the fluid sep-
arates into layers, there is mineral oil or other fluid
contamination of the brake fluid.
If the brake fluid is contaminated, drain and thor-
oughly flush the brake system. Replace all the rubber
parts or components containing rubber coming into
contact with the brake fluid including: the master
cylinder; proportioning valves; caliper seals; wheel
cylinder seals; ABS hydraulic control unit; and all
hydraulic fluid hoses.
SERVICE PROCEDURES
BRAKE FLUID LEVEL CHECKING
CAUTION: Use only Mopar brake fluid or an equiv-
alent from a tightly sealed container. Brake fluid
must conform to DOT 3 specifications. Do not use
petroleum-based fluid because seal damage in the
brake system will result.
Refer to SERVICE PROCEDURES in the BASE
BRAKE SYSTEM section in this group for the proper
procedure to check and adjust the brake fluid level in
the master cylinder fluid reservoir.
ANTILOCK BRAKE SYSTEM BLEEDING
The base brake’s hydraulic system must be bled
anytime air enters the hydraulic system. The ABS
though, particularly the ICU (HCU), should only be
bled when the HCU is replaced or removed from the
vehicle. The ABS must always be bled anytime it is
suspected that the HCU has ingested air. Under
most circumstances that require the bleeding of the
brakes
hydraulic
system,
only
the
base
brake
hydraulic system needs to be bled.
It is important to note that excessive air in the
brake system will cause a soft or spongy feeling
brake pedal.
During the brake bleeding procedure, be sure the
brake fluid level remains close to the FULL level in
the master cylinder fluid reservoir. Check the fluid
level periodically during the bleeding procedure and
add DOT 3 brake fluid as required.
The ABS must be bled as two independent braking
systems. The non-ABS portion of the brake system
with ABS is to be bled the same as any non-ABS sys-
tem.
The ABS portion of the brake system must be bled
separately. Use the following procedure to properly
bleed the brake hydraulic system including the ABS.
BLEEDING
When bleeding the ABS system, the following
bleeding sequence must be followed to insure com-
plete and adequate bleeding.
(1) Make sure all hydraulic fluid lines are installed
and properly torqued.
(2) Connect the DRB scan tool to the diagnostics
connector. The diagnostic connector is located under
the lower steering column cover to the left of the
steering column.
(3) Using the DRB, check to make sure the CAB
does not have any fault codes stored. If it does, clear
them using the DRB.
WARNING: WHEN BLEEDING THE BRAKE SYSTEM
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 YOUR-
SELF AND THE PAINTED SURFACES OF THE VEHI-
CLE. BRAKE FLUID AT HIGH PRESSURE MAY
COME OUT OF THE BLEEDER SCREWS WHEN
OPENED.
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BRAKES
5 - 93
DIAGNOSIS AND TESTING (Continued)
(4) Bleed the base brake system using the stan-
dard pressure or manual bleeding procedure as out-
lined in SERVICE PROCEDURES in the BASE
BRAKE SYSTEM section at the beginning of this
group.
(5) Using the DRB, select ANTILOCK BRAKES,
followed
by
MISCELLANEOUS,
then
BLEED
BRAKES. Follow the instructions displayed. When
the scan tool displays TEST COMPLETED, discon-
nect 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.
REMOVAL AND INSTALLATION
SERVICE WARNINGS AND CAUTIONS
Review this entire section prior to performing any
mechanical work on a vehicle equipped with ABS.
This section contains information on precautions per-
taining to potential component damage, vehicle dam-
age and personal injury which could result when
servicing an ABS equipped vehicle.
CAUTION: Only the recommended jacking or hoist-
ing positions for this vehicle are to be used when-
ever it is necessary to lift a vehicle. Failure to raise
a vehicle from the recommended locations could
result in lifting a vehicle by the hydraulic control
unit mounting bracket. Lifting a vehicle by the
hydraulic control unit mounting bracket will result
in damage to the mounting bracket and the hydrau-
lic control unit.
CAUTION: An attempt to remove or disconnect cer-
tain system components may result in improper
system operation. Only those components with
approved removal and installation procedures in
this manual should be serviced.
CAUTION: Brake fluid will damage painted sur-
faces. If brake fluid is spilled on any painted sur-
faces, wash off with water immediately.
CAUTION: When performing any service procedure
on a vehicle equipped with ABS do not apply a
12-volt power source to the ground circuit of the
pump motor in the HCU. Doing this will damage the
pump motor and will require replacement of the
entire HCU.
CAUTION: If welding work is to be performed on
the vehicle, using an electric arc welder, the CAB
connector should be disconnected during the weld-
ing operation.
CAUTION: The CAB 25-way connector should never
be connected or disconnected with the ignition
switch in the ON position.
Many components of the ABS System are not ser-
viceable and must be replaced as an assembly. Do not
disassemble any component which is not designed to
be serviced.
INTEGRATED CONTROL UNIT
NOTE: Before proceeding, review SERVICE WARN-
INGS AND CAUTIONS at the beginning of this
REMOVAL AND INSTALLATION section.
REMOVAL
(1) Remove the remote ground cable from the
ground stud on the left strut tower (Fig. 22).
Fig. 22 Remote Ground Cable Attachment To Strut
Tower
1 – SPEED CONTROL SERVO
2 – LEFT STRUT TOWER
3 – GROUND STUD
4 – AIR CLEANER
5 – REMOTE GROUND CABLE
6 – MASTER CYLINDER
5 - 94
BRAKES
JX
SERVICE PROCEDURES (Continued)
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