DaimlerChrysler LH New Yorker 1994, Electronic Service Manual

Page: 117 / 1203

To test the proportioning valve when the right rear
wheel slides first, leave the front brakes connected to
the valve, and proceed as follows:
(1) Install one gauge and (TEE) of set C-4007-A
between the brake line from the master cylinder sec-
ondary port and the brake valve assembly (Fig. 1).
(2) Install the second gauge of set C-4007-A to the
right rear brake outlet port (Fig. 1). Gauge to be
attached using an adapter tube, made from a short
piece of brake tube and (1) 3/8 x 24 tube nut, and (1)
M10x1 tube nut. Connect the hose to the valve. Bleed
the hose and gauge.
(3) Have a helper exert pressure on the brake pedal
(holding pressure) to get a reading on the valve inlet
gauge and check the reading on the outlet gauge. If
the inlet and outlet pressures do not agree with the
values on the following chart, replace the valve.
LEFT REAR WHEEL SLIDES FIRST
To test the proportioning valve when the left rear
wheel slides first, leave the front brakes connected to
the valve, and proceed as follows:
(1) Install one gauge and (TEE) of set C-4007-A
between brake line from master cylinder primary port
and brake valve assembly (Fig. 2).
(2) Install the second gauge of set C-4007-A to the
left rear brake outlet port (Fig. 2). An adapter tube,
made up from a M12x1 tube nut, a short piece of
brake tube and 3/8 x 24 tube nut, will be required to
connect hose to valve. Bleed the gauge and hose.
(3) Have a helper exert pressure on the brake
pedal. Hold pressure steady to get a reading on the
valve inlet gauge and check the reading on the outlet
gauge. If the inlet and outlet pressures do not agree
with the values on the following chart, replace the
valve.
TESTING ABS PROPORTIONING VALVES
All ABS components use an ISO type tubing flare.
Use the correct adapters with ISO type tubing flares
when installing gauges to test ABS proportioning
valves.
(1) Install one gauge and (TEE) between the hy-
draulic assembly and the male end (Inlet) of the
valve.
(2) Install the second gauge at the female end (Out-
let) of the valve (Fig. 3).
(3) Have a helper exert pressure on the brake pedal
(holding pressure) to get a reading on the valve inlet
gauge.
(4) Check the reading on the outlet gauge. If the
inlet and outlet pressures do not agree with the fol-
Fig. 1 Tube Connection For Right Rear Skidding
Fig. 2 Tube Connection For Left Rear Skidding
Fig. 3 Tube Connections for ABS
5 - 26 BRAKES