Chrysler Stratus Convertible. Manual — part 188
CAUTION: Be sure the pressure test fittings being
installed into proportioning valve, have the correct
thread sizes for installation into the proportioning
valve and installation of rear brake line tube nut.
(4) Install Pressure Test Fitting, Special Tool 8187
in the inlet port of the proportioning valve (Fig. 22).
Install Pressure Test Fitting, Special Tool 8187–2 in
the outlet port of the proportioning valve (Fig. 22).
Tighten tube nuts to a torque of 17 N·m (145 in. lbs.)
(5) Install the proportioning valve with the pres-
sure test fittings installed, in the chassis brake tube
(Fig. 23). Tighten both tube nuts to a torque of 17
N·m (145 in. lbs.).
(6) Install
a
Pressure
Gauge,
Special
Tool
C-4007-A into each pressure test fitting (Fig. 24).
Bleed air out of hose from pressure test fitting to
pressure gauge, at pressure gauge to remove all
trapped air. hose.
(7) 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.
(8) 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.
(9) Install proportioning valve in rear brake line
and hand tighten both tube nuts until they are fully
seated in proportioning valve.
(10) Tighten both brake line tube nuts at the pro-
portioning valve to a torque of 17 N·m (145 in. lbs.).
(11) Bleed the affected brake line. Refer to BASE
BRAKE
BLEEDING
in
the
SERVICE
PROCE-
DURES section.
Fig. 22 Pressure Test Fitting Installed In
Proportioning Valve
1 – SPECIAL TOOL 8187
2 – SPECIAL TOOL 8187–2
3 – PROPORTIONING VALVE
Fig. 23 Proportioning Valve With Pressure Test
Fittings Installed
1 – SPECIAL TOOL 8187–2
2 – PROPORTIONING VALVE
3 – STEERING GEAR
4 – SPECIAL TOOL 8187
Fig. 24 Pressure Gauges Installed On Pressure Test
Fittings
1 – PRESSURE TEST FITTING
2 – PRESSURE TEST FITTING
3 – PROPORTIONING VALVE
4 – SPECIAL TOOL C-4007–A
JX
BRAKES
5 - 15
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 ROTOR
Any servicing of the rotor requires extreme care to
maintain the rotor within service tolerances to
ensure proper brake action.
Excessive runout or wobble in a rotor can increase
pedal travel due to piston knock-back. This increases
guide pin sleeve wear due to the tendency of the cal-
iper to follow the rotor wobble.
When diagnosing a brake noise or pulsation, the
machined disc braking surface should be checked and
inspected.
BRAKING SURFACE INSPECTION
Light braking surface scoring and wear is accept-
able. If heavy scoring or warping is evident, the rotor
must be refaced or replaced. Refer to SERVICE PRO-
CEDURES in this section of this group for informa-
tion on brake rotor machining.
Excessive wear and scoring of the rotor can cause
improper lining contact on the rotor’s braking sur-
face. If the ridges on the rotor are not removed before
new brake shoes are installed, improper wear of the
shoes will result.
If a vehicle has not been driven for a period of
time, the rotor’s braking surface will rust in the
areas not covered by the brake shoes at that time.
Once the vehicle is driven, noise and chatter from
the disc brakes can result when the brakes are
applied.
Some discoloration or wear of the rotor surface is
normal and does not require resurfacing when lin-
ings are replaced. If cracks or burned spots are evi-
dent, the rotor must be replaced.
ROTOR MINIMUM THICKNESS
Measure rotor thickness at the center of the brake
shoe contact surface. Replace the rotor if it is worn
below minimum thickness or if machining the rotor
will cause its thickness to fall below specifications.
CAUTION: Do not machine the rotor if it will cause
the rotor to fall below minimum thickness.
Minimum thickness specifications are cast on the
rotor’s unmachined surface (Fig. 25). Limits can also
be found in the table at the end of this brake rotor
information.
ROTOR THICKNESS VARIATION
Thickness variation in a rotor’s braking surface
can result in pedal pulsation, chatter and surge. This
can also be caused by excessive runout in the rotor or
the hub.
Rotor thickness variation measurements should be
made in conjunction with measuring runout. Mea-
sure thickness of the brake rotor at 12 equal points
around the rotor braking surface with a micrometer
at a radius approximately 25 mm (1 inch) from edge
of rotor (Fig. 26). If thickness measurements vary by
more than 0.013 mm (0.0005 inch), the rotor should
refaced or replaced. Refer to SERVICE PROCE-
DURES in this section of this group for information
on brake rotor machining.
ROTOR RUNOUT
On-vehicle rotor runout is the combination of the
individual runout of the hub face and the runout of
the rotor. (The hub and rotor runouts are separable).
Fig. 25 Minimum Brake Rotor Thickness Markings
(Typical)
1 – ROTOR MINIMUM THICKNESS MARKING
2 – ROTOR
5 - 16
BRAKES
JX
DIAGNOSIS AND TESTING (Continued)
To measure rotor runout on the vehicle, first remove
the tire and wheel assembly. Reinstall the wheel
mounting nuts on the studs, tightening the rotor to
the hub. Mount the Dial Indicator, Special Tool
C-3339, with Mounting Adaptor, Special Tool SP-
1910 on steering arm. The dial indicator plunger
should contact braking surface of rotor approximately
25 mm (one inch) from outer edge of rotor (Fig. 27).
Check lateral runout on both sides of the rotor,
marking the low and high spots on both. Runout lim-
its can be found in the table at the end of this brake
rotor information.
If runout is in excess of the specification, check the
lateral runout of the hub face. Before removing the
rotor from the hub, place a chalk mark across both
the rotor and the one wheel stud closest to where the
high runout measurement was taken. This way, the
original mounting spot of the rotor on the hub is
indexed (Fig. 28).
Remove the rotor from the hub.
NOTE: Clean the hub face surface before checking
runout. This provides a clean surface to get an
accurate indicator reading.
Fig. 26 Checking Rotor For Thickness
1 – CALIPER
Fig. 27 Checking Rotor Runout
1 – SPECIAL TOOL SP-1910
2 – 25mm FROM EDGE
3 – DISC SURFACE
4 – SPECIAL TOOL C-3339
Fig. 28 Marking Rotor and Wheel Stud
1 – CHALK MARK
JX
BRAKES
5 - 17
DIAGNOSIS AND TESTING (Continued)
Mount Dial Indicator, Special Tool C-3339, and
Mounting Adaptor, Special Tool SP-1910, to the steer-
ing knuckle. Position the indicator stem so it contacts
the hub face near the outer diameter. Care must be
taken to position stem outside of the stud circle, but
inside of the chamfer on the hub rim (Fig. 29).
Hub runout should not exceed 0.08 mm (0.003
inch). If runout exceeds this specification, the hub
must be replaced. Refer to the SUSPENSION group
in this service manual for the hub and bearing
removal and installation procedure.
If the hub runout does not exceed this specifica-
tion, install the rotor back on the hub, aligning the
chalk marks on the rotor with a wheel mounting
stud, two studs apart from the original stud (Fig. 30).
Tighten nuts in the proper sequence and torque to
specifications.
Recheck brake rotor runout to see if the runout is
now within specifications.
If runout is not within specifications, reface or
replace the brake rotor. Refer to SERVICE PROCE-
DURES in this section of this group for information
on brake rotor machining.
BRAKE ROTOR LIMITS
Braking Rotor
Rotor Thickness
Minimum
Rotor
Thickness
Rotor
Thickness
Variation
Rotor
Runout*
Rotor Micro
Finish
Front Rotor
22.87–23.13 mm
0.900-0.911 in.
21.4 mm
0.843 in.
0.013 mm
0.0005 in.
0.13 mm
0.005 in.
15-80 RMS
Rear Rotor
8.87–9.13 mm
0.350-0.360 in.
7.25 mm
0.285 in.
0.013 mm
0.0005 in.
0.13 mm
0.005 in.
15-80 RMS
* TIR Total Indicator Reading (Measured On Vehicle)
BRAKE DRUM
With the drum off the vehicle, measure the drum
for diameter variation (oval shape). The diameter
variation of the drum braking surface must not
exceed either 0.0635 mm (0.0025 inch) in 30° or
0.0889 mm (0.0035 inch) in 360°.
Measure brake drum runout. Brake drum runout
should be checked with the drum mounted on a
brake lathe. Brake drum runout should not exceed
0.1524 mm (0.006 inch).
If either of these measurements are not within
specification, reface or replace the drum. Refer to
Fig. 29 Checking Hub Runout
1 – HUB SURFACE
2 – SPECIAL TOOL C-3339
3 – SPECIAL TOOL SP-1910
Fig. 30 Index Rotor And Wheel Stud
1 – CHALK MARK
5 - 18
BRAKES
JX
DIAGNOSIS AND TESTING (Continued)
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