Chrysler 300M, Dodge Interpid. Manual — part 41
(21) Pull back floor carpeting on left side of pas-
senger compartment to reveal front park brake cable.
(22) Remove the screw securing the foot rest to the
floor. Remove the foot rest.
(23) Remove the 2 screws securing the front park
brake cable retainer bracket to the rear floor pan
(Fig. 108).
(24) Remove 2 routing bracket screws securing
front park brake cable to left side of the passenger
compartment floor. One screw is at the base of the
B-pillar by the seat belt anchor bolt (Fig. 108), and
the other is below the park brake lever assembly on
the floor pan (Fig. 109).
(25) Remove the rear bolt, and loosen the 2 front
nuts on studs, securing the parking brake lever
assembly in place.
(26) Lower the parking brake lever assembly
enough to gain access to the warning lamp ground
wire connector. Remove the brake warning light
ground wire from the switch on the park brake lever
assembly.
(27) Continue to move parking brake lever, with
front park brake cable attached, downward, and
remove both from vehicle together.
INSTALLATION - PARKING BRAKE LEVER AND
CABLE
(1) Install the parking brake lever, with front
cable, back in vehicle by first running the front cable,
starting from front to the rear, along the left side of
passenger compartment. Guide it into the hole at the
rear of the floor pan.
(2) Guiding the lever assembly up past the fuse junc-
tion block, position the park brake release cable into
place. Also, reinstall the brake warning lamp wire,
through access hole in lever assembly, onto switch.
(3) Position the lever assembly in its mounting
place. Install the rear mounting bolt and tighten it to
a torque of 27 N·m (19 ft. lbs.). Tighten the 2 mount-
ing nuts to a torque of 27 N·m (19 ft. lbs.).
(4) Ensure that the park brake cable is properly
routed and install the two routing bracket screws.
(5) Install the 2 screws securing the front park
brake cable retainer bracket to the rear floor pan.
(6) Install the foot rest, securing it in place with
its one mounting screw.
(7) Reposition the carpeting in place.
(8) Reinstall the front seat belt anchor bolt at the
base of the B-pillar.
(9) Reinstall the rear door opening sill cover.
(10) Reposition the fuse junction block in place,
and install the two lower, then, the two upper mount-
ing screws.
(11) Reinstall the lower A/C duct in place.
(12) Install the diagnostic connector to the instru-
ment panel steel reinforcement. Reinstall the steel
reinforcement to the instrument panel.
(13) Connect the park brake release cable to the
release handle.
(14) Reconnect the trunk release harness connec-
tor to the release switch.
(15) Reinstall the lower instrument panel cover
below the steering column. Reinstall the 2 screws
securing the lower instrument panel cover behind the
fuse panel cover.
Fig. 108 Front Park Brake Cable At Rear Floor Pan
1 - REAR SEAT CUSHION
2 - B-PILLAR
3 - ROUTING BRACKET SCREW
4 - FRONT PARK BRAKE CABLE
5 - FLOOR PLAN
6 - RETAINER BRACKET SCREWS
Fig. 109 Front Park Brake Cable Attachment At
Front Floor Pan
1 - TO PARK BRAKE LEVER
2 - ROUTING BRACKET SCREW
3 - FLOOR PLAN
4 - DOOR SILL
5 - WIRE HARNESS
6 - FRONT PARK BRAKE CABLE
LH
BRAKES - BASE BRAKE SYSTEM
5 - 59
PARKING BRAKE LEVER (Continued)
(16) Reinstall the fuse panel cover on left side of
instrument panel.
(17) Reinstall driver’s side kick panel
(18) Reinstall driver’s door opening sill cover
(19) Raise the vehicle up.
(20) Reconnect the cable connector between the
front and intermediate cables.
(21) Adjust parking brake. (Refer to 5 - BRAKES -
BASE/PARKING BRAKE - ADJUSTMENTS)
(22) Lower the vehicle.
PARKING BRAKE SHOES
REMOVAL - PARKING BRAKE SHOES
(1) Remove rear disc brake caliper assembly from
adapter and rotor. (Refer to 5 - BRAKES - BASE/HY-
DRAULIC/MECHANICAL/DISC BRAKE CALIPERS
- REMOVAL)
(2) Remove rear rotor from rear hub.
(3) Remove dust cap from rear hub.
(4) Remove the cotter pin, nut retainer, wave
washer and rear hub/bearing assembly retaining nut
and washer from the rear spindle.
(5) Remove rear hub and bearing assembly from
rear spindle.
(6) Remove rear brake shoe assembly hold down clip.
(7) Turn brake shoe adjuster wheel until adjuster
is at shortest length.
(8) Remove adjuster assembly from the parking
brake shoe assemblies.
(9) Remove lower shoe to shoe spring.
(10) Pull rear brake shoe assembly away from
anchor, then remove rear brake shoe and upper spring.
(11) Remove front brake shoe hold-down clip, then
remove front brake shoe assembly.
INSTALLATION - PARKING BRAKE SHOES
(1) Install front brake shoe and hold down clip.
(2) Install rear brake shoe and the upper brake
shoe to shoe return spring.
(3) Pull rear brake shoe over anchor block until
properly located on adapter.
(4) Install the lower shoe to shoe return spring.
(5) Install brake shoe adjuster assembly with star
wheel rearward.
(6) Install rear brake shoe hold down clip.
(7) Adjust brake shoes to a diameter to 171 mm
(6.75 inch).
(8) Install rear hub and bearing assembly on spin-
dle.
(9) Install hub and bearing assembly washer and
retaining nut. Torque the hub and bearing assembly
retaining nut to 168 N·m (124 ft. lbs.).
(10) Install the wave washer, retaining nut and
cotter pin.
(11) Install hub and bearing assembly dust cap.
(12) Install rear brake rotor.
(13) Install rear disc brake caliper on the adapter.
(Refer to 5 - BRAKES - BASE/HYDRAULIC/ME-
CHANICAL/DISC BRAKE CALIPERS - INSTALLA-
TION)
(14) Install wheel and tire assemblies. Tighten
wheel mounting nuts to 135 N·m (100 ft.lbs.).
5 - 60
BRAKES - BASE BRAKE SYSTEM
LH
PARKING BRAKE LEVER (Continued)
BRAKES - ANTILOCK BRAKE SYSTEM
TABLE OF CONTENTS
page
page
BRAKES - ANTILOCK BRAKE SYSTEM
. . . . . . . . . . . . . . 61
DESCRIPTION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING . . . . . . . . . . . . . . . 62
DESCRIPTION - TRACTION CONTROL
. . . . . . . . . . . . . . . 63
OPERATION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING . . . . . . . . . . . . . . . 63
. . . . . . . . . . . . . . . . . . . . . . . . . . 64
DIAGNOSIS AND TESTING - INSPECTION
. . . . . . . . . . . . . . . . . . . . . 64
STANDARD PROCEDURE - ANTILOCK BRAKE
. . . . . . . . . . . . . . . . . . . 65
. . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . 66
FRONT WHEEL SPEED SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
. . . . . . . . . . . . . . . . . . . . . . . . . 67
REAR WHEEL SPEED SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . 68
. . . . . . . . . . . . . . . . . . . . . . . . . . . 68
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
. . . . . . . . . . . . . . . . . . . . . . . . . 68
TONE WHEEL
. . . . . . . . . . . . . . . . . . . . . . . . . 69
. . . . . . . . . . . . . . . . . . . . . . . . . . . 69
. . . . . . . . . . . . . . . . . . . . . . . . . . 69
TRACTION CONTROL SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
. . . . . . . . . . . . . . . . . . . . . . . . . 69
HYDRAULIC/MECHANICAL
OPERATION - HYDRAULIC CIRCUITS AND
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
HCU (HYDRAULIC CONTROL UNIT)
. . . . . . . . . . . . . . . . . . . . . . . . . 75
. . . . . . . . . . . . . . . . . . . . . . . . . . . 75
. . . . . . . . . . . . . . . . . . . . . . . 75
. . . . . . . . . . . . . . . . . . . . 75
ICU (INTEGRATED CONTROL UNIT)
. . . . . . . . . . . . . . . . . . . . . . . . . 76
. . . . . . . . . . . . . . . . . . . . . . . . . . . 76
. . . . . . . . . . . . . . . . . . . . . . . . 77
. . . . . . . . . . . . . . . . . . . . 78
. . . . . . . . . . . . . . . . . . . . . . . 79
. . . . . . . . . . . . . . . . . . . . 79
BRAKES - ANTILOCK BRAKE
SYSTEM
DESCRIPTION
DESCRIPTION - ANTILOCK BRAKES
This section covers the physical and operational
descriptions and the on-car service procedures for
vehicles equipped with the Mark 20e Antilock Brake
System and the Mark 20e Antilock Brake System
with traction control.
The purpose of this four-channel design antilock
brake system is to prevent wheel lockup under brak-
ing conditions on virtually any type of road surface.
Antilock braking is desirable because a vehicle that
is stopped without locking the wheels retains direc-
tional stability and some steering capability. This
allows the driver to retain greater control of the vehi-
cle during braking.
This system features ABS Plus and Electronic Vari-
able Brake Proportioning (EVBP). (Refer to 5 -
BRAKES - ABS - ABS PLUS - DESCRIPTION)(Refer
to 5 - BRAKES - ABS - ELECTRONIC VARIABLE
BRAKE PROPORTIONING - DESCRIPTION)
For information on traction control equipped vehi-
cles, (Refer to 5 - BRAKES - ABS - TRACTION CON-
TROL - DESCRIPTION).
DESCRIPTION - ABS PLUS
There is an ABS Plus function built into the ABS
CAB. ABS Plus is a brake-on stability enhancement.
It is designed to help maintain the directional stabil-
ity of the vehicle during braking. There are no addi-
tional external components required for this function.
LH
BRAKES - ANTILOCK BRAKE SYSTEM
5 - 61
DESCRIPTION - ELECTRONIC VARIABLE
BRAKE PROPORTIONING
Vehicles equipped with ABS use electronic variable
brake proportioning (EVBP) to balance front-to-rear
braking. The EVBP is used in place of a rear propor-
tioning valve. The EVBP system uses the ABS sys-
tem to control the slip of the rear wheels in partial
braking range. The braking force of the rear wheels
is controlled electronically by using the inlet and out-
let valves located in the integrated control unit
(ICU).
EVBP activation is invisible to the customer since
there is no pump motor noise or brake pedal feed-
back.
DESCRIPTION - TRACTION CONTROL
Traction control reduces wheel slip and maintains
traction at the driving wheels at speeds below 56
km/h (35 mph) when road surfaces are wet or snow
covered. The traction control system reduces wheel
slip by braking the wheel that is losing traction.
OPERATION
OPERATION - ANTILOCK BRAKES
There are a few performance characteristics of the
Mark 20e Antilock Brake System that may at first
seem abnormal, but in fact are normal. These char-
acteristics are described below.
NORMAL BRAKING
Under normal braking conditions, the ABS func-
tions the same as a standard base brake system with
a diagonally split master cylinder and conventional
vacuum assist.
ABS BRAKING
ABS operation is available at all vehicle speeds
above 5–8 km/h (3–5 mph). If a wheel locking ten-
dency is detected during a brake application, the
brake system enters the ABS mode. During ABS
braking, hydraulic pressure in the four wheel circuits
is modulated to prevent any wheel from locking.
Each wheel circuit is designed with a set of electric
solenoids
to
allow
modulation
and
each
wheel
receives its own separate electrical signal. Wheel
lockup may be perceived at the very end of an ABS
stop and is considered normal.
During an ABS stop, the brakes hydraulic system
is still diagonally split. However, the brake system
pressure is further split into four control channels.
During antilock operation of the vehicle’s brake sys-
tem, the front wheels are controlled independently
and are on two separate control channels, and the
rear wheels are controlled together for better vehicle
stability.
The system can build and release pressure at each
wheel, depending on signals generated by the wheel
speed sensors (WSS) at each wheel and received at
the controller antilock brake (CAB).
NOISE AND BRAKE PEDAL FEEL
During ABS braking, some brake pedal movement
may be felt. In addition, ABS braking will create
ticking, popping, or groaning noises heard by the
driver. This is normal and is due to pressurized fluid
being transferred between the master cylinder and
the brakes. If ABS operation occurs during hard
braking, some pulsation may be felt in the vehicle
body due to fore and aft movement of the suspension
as brake pressures are modulated.
At the end of an ABS stop, ABS is turned off when
the vehicle is slowed to a speed of 5–7 km/h (3–4
mph). There may be a slight brake pedal drop any-
time that the ABS is deactivated, such as at the end
of the stop when the vehicle speed is less than 5
km/h (3 mph) or during an ABS stop where ABS is
no longer required. These conditions exist when a
vehicle is being stopped on a road surface with
patches of ice, loose gravel, or sand on it. Also, stop-
ping a vehicle on a bumpy road surface activates
ABS because of the wheel hop caused by the bumps.
TIRE NOISE AND MARKS
Although the ABS system prevents complete wheel
lockup, some wheel slip is desired in order to achieve
optimum braking performance. Wheel slip is defined
as follows: 0 percent slip means the wheel is rolling
freely and 100 percent slip means the wheel is fully
locked. During brake pressure modulation, wheel slip
is allowed to reach up to 25–30 percent. This means
that the wheel rolling velocity is 25–30 percent less
than that of a free rolling wheel at a given vehicle
speed. This slip may result in some tire chirping,
depending on the road surface. This sound should not
be interpreted as total wheel lockup.
Complete wheel lockup normally leaves black tire
marks on dry pavement. The ABS will not leave dark
black tire marks since the wheel never reaches a
fully locked condition. However, tire marks may be
noticeable as light patched marks.
START-UP CYCLE
When the ignition is turned on, a popping sound
and a slight brake pedal movement may be noticed.
The ABS warning indicator lamp will also be on for
up to 5 seconds after the ignition is turned on. These
conditions occur as part of ABS self-diagnosis check.
The popping sound is a result of brief activation of
the solenoids in the integrated control unit.
5 - 62
BRAKES - ANTILOCK BRAKE SYSTEM
LH
BRAKES - ANTILOCK BRAKE SYSTEM (Continued)
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