Chrysler 1997 Stratus Convertible RHD Service Manual page 174

BAR TO REAR BRAKE LINE CODE LABEL STAMP AND
5 - 72 BRAKES
DIAGNOSIS AND TESTING (Continued)
determine cause and correct before replacing the
wheel speed sensor.
Excessive runout of the tonewheel can cause
erratic wheel speed sensor signals. Refer to Tone-
wheel Runout in the Specification Section in this sec-
tion of the service manual for the tonewheel runout
specification. Replace drive shaft assembly or rear
hub/bearing assembly if tonewheel runout exceeds
the specification.
Inspect tonewheels for looseness on their mounting
surfaces. Tonewheels are pressed onto their mounting
surfaces and should not rotate independently from
the mounting surface.
Check the wheel speed sensor head alignment to
the tone wheel. Also check the gap between the speed
sensor head and the tone wheel to ensure it is at
specification. Refer to Wheel Speed Sensor Clearance
in the Specification Section in this section of the ser-
vice manual.
HYDRAULIC SYSTEM PROPORTIONING VALVE
CAUTION: Proportioning valves (Fig. 8) should
never be disassembled.
Fig. 8 Proportioning Valve Identification
If premature rear wheel skid occurs on hard brake
application, it could be an indication that a malfunc-
tion has occurred with one of the proportioning
valves.
One proportioning valve controls the right rear
brake, and the other proportioning valve controls the
left rear brake. Therefore, a road test to determine
which rear brake slides first is essential.
If a malfunctioning proportioning valve is sus-
pected on a vehicle equipped with ABS brakes. Refer
to Proportioning Valve Test With ABS Brakes in the
Proportioning Valves Section in this group of the ser-
vice manual.
BRAKE FLUID CONTAMINATION
Indications of fluid contamination are swollen or
deteriorated rubber parts.
Swollen rubber parts indicate the presence of
petroleum in the brake fluid.
O-RING SEAL TO MASTER CYLINDER OR HYDRAULIC CONTROL UNIT
drained brake fluid in clear glass jar. If fluid sepa-
rates into layers, there is mineral oil or other fluid
contamination of the brake fluid.
oughly flush system. Replace master cylinder, propor-
tioning valve, caliper seals, wheel cylinder seals,
Antilock Brakes hydraulic unit and all hydraulic
fluid hoses.
VEHICLE TEST DRIVE INFORMATION AND
PROCEDURE
part of the diagnostic procedure. The purpose of the
test drive is to duplicate the condition.
NOTE:
turning on of the Red BRAKE Warning Lamp may
indicate reduced braking ability. The following pro-
cedure should be used to test drive an ABS com-
plaint vehicle.
whether the Red Brake Warning Lamp or Amber
ABS Warning Lamp is turned on. If it is the Red
Brake Warning Lamp, refer to the hydraulic system
section in the brake group of this manual. If the ABS
Warning lamp was/is on, test drive the vehicle as
described below, to verify the complaint. While the
ABS Warning Lamp is on, the ABS system is not
functional. The standard brake system and the abil-
ity to stop the car is not be affected if only the ABS
Warning Lamp is on.
to the on position. Note whether the ABS Warning
Lamp continues to stay on. If it does, refer to the
ABX-4 Diagnostic Manual for the required test pro-
cedures.
gear and drive the car to a speed of 5 mph to com-
plete the ABS start up cycle. If at this time the ABS
Warning Lamp goes on refer to the ABX-4 Diagnostic
Manual.
the vehicle a short distance. During this test drive be
sure that the vehicle achieves at least 25 mph. Brake
to at least one complete stop and again accelerate to
25 mph.
determined while test driving a vehicle, refer to the
ABX-4 Diagnostics Manual for required test proce-
dures and proper use of the DRB tester.
ABS SERVICE PRECAUTIONS
CAB. This module is designed to withstand normal
current draws associated with vehicle operation.
To test for contamination, put a small amount of
If brake fluid is contaminated, drain and thor-
Most ABS complaints will require a test drive as a
Remember conditions that result in the
Before test driving a brake complaint vehicle, note
(1) Turn the key to the off position and then back
(2) If the ABS Warning Lamp goes out, shift into
(3) If the ABS Warning Lamp remains OUT, drive
(4) If a functional problem with the ABS system is
The ABS uses an electronic control module, the
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