Proportioning Valves - Chrysler 1997 Stratus Convertible RHD Service Manual

TWELVE EQUAL POINTS ON CALIPER DISC
JX
DIAGNOSIS AND TESTING (Continued)
Fig. 23 Checking Rotor For Thickness
machined or replaced. See Brake Rotor Machining in
the Service Procedures Section in this group of the
service manual. Refer to front or rear brake rotor in
the Removal And Installation section in this group of
the service manual for the required brake rotor
replacement procedure.

PROPORTIONING VALVES

PROPORTIONING VALVE TESTING SPECIAL
TOOLS
The in-line proportioning valves used on this vehi-
cle, require special pressure fittings to test for proper
proportioning valve function. The pressure fittings
are installed before and after the proportioning valve
being tested. This is to verify the proportioning valve
is maintaining the required hydraulic pressure to the
rear wheel brake it controls.
If a condition of premature rear wheel skid occurs
on a vehicle the proportioning valve should always be
tested prior to it being replaced. This is due to the
fact that there are conditions other then a faulty pro-
portioning valve which can cause a premature rear
wheel skid.
Testing proportioning valve pressures on a vehicle
with or without ABS requires using the same special
tools.
There are 4 new Pressure Fittings, Special Tool
6805 (Fig. 24) which are to be used for testing the
proportioning valves. These same pressure fittings
are used if the proportioning valves are either
mounted in the HCU, on an antilock equipped vehi-
cle, or in-line on the brake tube on non-antilock
equipped vehicles.
Fig. 24 Proportioning Valve Pressure Test Fittings
The pressure gauges used with the pressure test SPECIAL TOOL C-4007–A
fittings for testing the in-line proportioning valves on
both non-ABS and ABS brakes, is the Pressure
Gauge Set, Special Tool C-4007-A, currently used for
testing the combination valve (Fig. 25).
Fig. 25 Proportioning Valve Pressure Test Gauge
PROPORTIONING VALVE TESTING NON-ABS
BRAKES
If premature rear wheel skid occurs on a hard
brake application, it could be an indication that a
malfunction has occurred with one of the rear brake
proportioning valves.
One proportioning valve controls the right rear
brake, and the other proportioning valve controls the
left rear brake (Fig. 26). Therefore, a road test to
determine which rear brake slides first is essential.
Once the wheel which slides first is determined, use
the following procedure to diagnose the proportioning
valve.
BRAKES
Set
5 - 15