Fig. 4 Tube Connection for Right Rear Skidding

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, proceed as follows:

(1)Install one gauge and (TEE) of set C-4007-A between brake line from the master cylinder primary port and the brake valve assembly.

(2)Install the second gauge of set C-4007-A to the left rear brake outlet port (Fig. 5). An adapter tube, made up from a 7/16 x 24 tube nut, a short piece of brake tube and 3/8 x 24 tube nut. Will be required to connect the hose to the 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.

Fig. 5 Tube Connection for Left Rear Skidding

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 hydraulic assembly and the male end (Inlet) of the valve.

(2)Install the second gauge at the female end (Outlet) of the valve (Fig. 6).

Fig. 6 Tube Connections for ABS

(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 following chart, replace the valve. See (Fig. 3) for proportioning valve identification.