Chrysler 300M 2002 Service Manual page 147

5 - 48 BRAKES - BASE BRAKE SYSTEM
PROPORTIONING VALVE (Continued)
(14) Install a Pressure
C-4007-A, to the Adapter.
(15) Tighten all tube nut fittings to 17 N·m (145
in. lbs.) torque.
(16) Bleed any air out of the system. This includes
bleeding the air from the hose between the pressure
test fitting and pressure gauge, which is done at the
pressure gauge.
(17) With the aid of a helper, apply pressure to the
brake pedal until reading on proportioning valve
inlet gauge (at master cylinder) is at the pressure
shown on the chart at the end of this procedure.
Then check the pressure reading on the proportion-
ing valve outlet gauge (at junction block outlet to
rear brake). If proportioning valve outlet pressure
does not agree with value shown on the chart (once
inlet pressure shown on chart is obtained), replace
the junction block (with internal proportioning
valves) (Refer to 5 - BRAKES - BASE/HYDRAULIC/
MECHANICAL/JUNCTION BLOCK - REMOVAL). If
pressure is within specifications, do not replace pro-
portioning valve and perform the following steps.
(18) Remove the Pressure Gauge and Adapter,
Special Tool 8494-3 or 8494-4, from junction block.
(19) Reinstall the chassis brake tube to the junc-
tion block port. Tighten tube nut fitting to 17 N·m
(145 in. lbs.) torque.
PROPORTIONING VALVE APPLICATIONS AND PRESSURE SPECIFICATIONS
Sales
Brake System Type
Code
All All Disc/Disc
ROTOR
DIAGNOSIS AND TESTING - 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 5 - BRAKES -
BASE/HYDRAULIC/MECHANICAL/ROTORS
STANDARD PROCEDURE)
Gauge, Special Tool
Split Point
400 psi
(20) Install the transmission control module (with
speed control servo attached) in its normal position
(Fig. 86). Install the nut and screw securing it in
place.
(21) Install the
mounting nut and screw securing it in place. Tighten
the screw to 6 N·m (45 in. lbs.). Tighten the nut to 12
N·m (107 in. lbs.) torque.
(22) Install the screw attaching the washer filler
tube to the upper radiator closure panel (Fig. 85).
(23) Install the screw attaching the speed control
servo to the upper radiator closure panel (Fig. 85).
(24) Remove the Pressure Gauge and Adapter from
master cylinder.
(25) Install the brake tube to the master cylinder
primary or secondary port. Tighten the tube nut to a
torque of 17 N·m (145 in. lbs.).
(26) Bleed the affected brake line. (Refer to 5 -
BRAKES - BASE - STANDARD PROCEDURE)
(27) If no problem is found with the proportioning
valves, check the rear wheel brake shoe linings for
contamination or for replacement brake shoes not
meeting OEM brake lining material specifications.
These conditions can also cause premature rear
wheel skid.
Slope Identification
0.34 Bar Code Label
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.
transmission control
Inlet Outlet
Pressure Pressure
1000 psi 525-625 psi
LH
module