Chrysler New Yorker. Manual — part 23
inboard port of the junction block supplies the right
front and left rear brakes. The outboard port of the
junction block supplies the left front and right rear
brakes.
On vehicles equipped with Antilock Brakes (with or
without Traction Control), the master cylinder pri-
mary outlet port outlet tubes connect to the inboard
port of the ICU, and the secondary outlet port outlet
tubes connect to the outboard port of the ICU.
VACUUM BOOSTER
The purpose of the vacuum operated power brake
booster. Is to reduce the amount of force applied to
the brake pedal by the drivers foot. To obtain the
required hydraulic pressure in the brake system to
stop the vehicle.
This vehicle utilizes a Bosch vacuum booster for all
applications.
The power brake booster can be identified if
required, by the tag attached to the body of the
booster assembly (Fig. 7). This tag contains the fol-
lowing information. The production part number of
the power booster assembly, the date it was built and
who manufactured it.
NOTE: The power brake booster assembly is not a
repairable part and must be replaced as a complete
unit if it is found to be faulty in any way. The power
booster vacuum check valve is not repairable but
can be replaced as an assembly.
Fig. 4 Rear Disc Brake Assembly
Fig. 5 Drum In Hat Braking Disc
Fig. 6 Proportioning Valve
5 - 6
BRAKES
300M
DESCRIPTION AND OPERATION (Continued)
The power brake booster is vacuum operated. The
vacuum is supplied from the intake manifold on the
engine through the power brake booster check valve
(Fig. 8).
As the brake pedal is depressed, the power boost-
ers input rod moves forward. This opens and closes
valves in the power booster, creating a vacuum on
one side of a diaphragm and allowing atmospheric
pressure to enter on the other. This difference in
pressure forces the output rod of the power booster
out against the primary piston of the master cylin-
der. As the pistons in the master cylinder move for-
ward this creates the hydraulic pressure in the brake
system.
Different engine combinations require different
vacuum hose routings.
The power brake booster assembly mounts on the
engine side of the dash panel. It is externally con-
nected to the brake system by an input push rod to
the brake pedal. A vacuum line connects the power
booster to the intake manifold. The master cylinder
is bolted to the front of the power brake booster
assembly.
RED BRAKE WARNING LAMP
The red Brake warning lamp is located in the
instrument cluster and is used to indicate a low
brake fluid condition or that the parking brake is
applied. In addition, the brake warning lamp is
turned on as a bulb check by the ignition switch
when the ignition switch is placed in the crank posi-
tion. Problems with this system will generally be of
the type where the warning lamp fails to turn on
when it should, or remains on when it should not.
The warning lamp bulb is supplied a 12-volt igni-
tion feed anytime the ignition switch is on. The bulb
is then illuminated by completing the ground circuit
either through the park brake switch, the fluid level
sensor in the master cylinder reservoir, or the igni-
tion switch in the crank position.
As the fluid drops below the minimum level, the
fluid level sensor closes the brake warning light cir-
cuit.
MASTER CYLINDER RESERVOIR FLUID LEVEL
SENSOR
The purpose of the brake fluid level sensor is to
provide the driver with early warning that brake
fluid in the master cylinder is below a normal level.
The brake fluid level sensor used on this vehicle’s
master cylinder is internal to the master cylinder
fluid reservoir (Fig. 9). The vehicle wiring harness
has a connector which plugs directly into the brake
fluid reservoir.
As the fluid drops below the design level the sensor
closes the Red Brake Warning Light circuit. This will
turn on the red brake warning light. At this time, the
master cylinder fluid reservoir should be checked and
filled to the full mark with DOT 3 brake fluid. If the
brake fluid level has dropped in the master cyl-
inder fluid reservoir, the entire brake hydraulic
system should be checked for evidence of a
leak.
The brake fluid level sensor in the master cylinder
brake fluid reservoir is not a repairable item. If the
level sensor is found to be defective the brake fluid
reservoir must be replaced.
Fig. 7 Power Brake Booster Identification
Fig. 8 Power Brake Booster Assembly
300M
BRAKES
5 - 7
DESCRIPTION AND OPERATION (Continued)
STOP LAMP SWITCH
The stop lamp switch controls operation of the
vehicles stop lamps. Also, if the vehicle is equipped
with speed control, the stop lamp switch will deacti-
vate
speed
control
when
the
brake
pedal
is
depressed.
The stop lamp switch controls operation of the
right and left tail, stop and turn signal lamp and
CHMSL lamp, by supplying battery current to these
lamps.
The stop lamp switch controls the lamp operation
by opening and closing the electrical circuit to the
stop lamps.
REAR WHEEL HUB AND BEARING
CAUTION: If a vehicle is equipped with antilock
brakes, the tone wheels for the rear wheel speed
sensors are pressed onto the hub.
All vehicles are equipped with permanently lubri-
cated, and sealed for life, rear wheel bearings. There
is no periodic lubrication or maintenance recom-
mended for these units. However, if servicing of a
rear wheel hub and bearing is required, refer to pro-
cedures in the diagnosis and testing section, or the
removal and installation section in this group of the
service manual for the inspection and replacement of
the rear wheel hub and bearing.
DIAGNOSIS AND TESTING
BRAKE SYSTEM BASIC DIAGNOSIS GUIDE
SYMPTOM
CHART 1
MISC.
COND.
CHART 2
WARNING
LIGHT
CHART 3
POWER
BRAKES
CHART 4
BRAKE NOISE
CHART 5
WHEEL BRAKES
Brake Warning
Light On
X
NO
NO
Excessive
Pedal Travel
6
X
NO
O
Pedal Goes To
The Floor
6
X
Stop Light On
Without Brakes
3
All Brakes Drag
5
Rear Brakes
Drag
2
NO
NO
Grabby Brakes
O
X
Spongy Brake
Pedal
X
NO
Premature
Rear Brake
Lockup
4
NO
NO
O
Excessive
Pedal Effort
1
O
Fig. 9 Master Cylinder Reservoir Level Sensor
5 - 8
BRAKES
300M
DESCRIPTION AND OPERATION (Continued)
SYMPTOM
CHART 1
MISC.
COND.
CHART 2
WARNING
LIGHT
CHART 3
POWER
BRAKES
CHART 4
BRAKE NOISE
CHART 5
WHEEL BRAKES
Rough Engine
Idle
NO
O
Brake Chatter
(Rough)
NO
NO
X
Surge During
Braking
NO
NO
X
Noise During
Braking
NO
NO
X
Rattle Or
Clunking Noise
NO
NO
X
Pedal Pulsates
During Braking
NO
NO
X
Pull To Right
Or Left
NO
NO
X
No: Not A Possible Cause
X: Most Likely Cause
O: Possible Cause
300M
BRAKES
5 - 9
DIAGNOSIS AND TESTING (Continued)
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