Chrysler neon 1997 Service Manual page 94

SPECIAL TOOL 6805-3 OR PROPORTIONING VALVE SPECIAL TOOL 6805-1 6805-4 OR 6805-2
PL
DIAGNOSIS AND TESTING (Continued)
(4) Install Pressure Test Fitting, Special Tool
6805-1 or 6805-2 (Fig. 27) into the outlet port of the
master cylinder, which the proportioning valve was
removed from.
(5) Install proportioning valve into pressure test
fitting installed in master cylinder outlet port (Fig.
27).
CAUTION: Be sure the pressure test fitting being
installed into proportioning valve, has the correct
thread sizes for installation into the proportioning
valve and installation of brake tube fitting.
(6) Install Pressure Test Fitting, Special Tool
6805-3 or 6805-4 (Fig. 27) into the outlet port of the
proportioning valve.
(7) Connect brake hydraulic tube onto the pressure
test fitting that was installed in proportioning valve
(Fig. 27).
Fig. 27 Proportioning Valve Installation For
Pressure Testing
(8) Install a Pressure
C-4007-A into each pressure test fitting (Fig. 28).
Bleed air out of hose from pressure test fitting to
pressure gauge, at pressure gauge to remove all
trapped air. hose.
(9) 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. Then check the pressure reading on the pro-
portioning valve outlet 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.
(10) 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.
MASTER CYL- I NDER
Gauge, Special Tool
PROPOR- TIONING VALVE SPECIAL C-4007-A PRESSURE TEST FIT- TOOL
Fig. 28 Pressure Gauges Installed On Pressure Test
(11) Install proportioning valve in master cylinder
and hand tighten
installed and O-ring seal is seated into master cylin-
der. Then torque proportioning valve to 40 N·m (30
ft. lbs.).
(12) Install brake tube on proportioning valve.
Torque tube nut to 17 N·m (145 in. lbs.) torque.
(13) Bleed the affected brake line. See Bleeding
Brake System in the Service Adjustments section of
the manual for proper bleeding procedure
PROPORTIONING VALVE TEST WITH ABS
BRAKES
If premature rear wheel ABS cycling occurs on a
hard brake application, it could be an indication that
a malfunction has occurred with one of the propor-
tioning valves.
BRAKE T UBES One proportioning valve controls the right rear PROPORTIONING VALVES
brake, and the other proportioning valve controls the
left rear brake (Fig. 29). Since ABS cycles both rear
brakes together, both valves must be tested to isolate
the suspect proportioning valve.
Fig. 29 Proportioning Valve Locations On HCU
TINGS BLEED AIR FROM GAUGE HOSES HERE
BRAKES
Fittings
until proportioning
HCU POWER VACUUM BOOSTER BRAKE
5 - 17
is fully