DESCRIPTION & OPERATION Hydraulic brake system has power assisted dual piston master cylinder with diagonally split disc brakes in front and drum brakes in rear. Wheel speed sensors signal ABS control module, which allows ABS hydraulic actuator to control braking effort on separate brakes to control tendency to skid during a stop. A dual load spring valve is located on rear axle. When vehicle is unloaded, valve closes partially reducing pressure to rear brakes. As vehicle is loaded, valve opens gradually until full pressure is supplied for a full load. See Fig. 1 .
BRAKE LOAD SENSOR PROPORTIONING VALVE Measure spring length with vehicle in unloaded position. Spring length "A" should measure 6.25- 6.37" (158.8-161.8 mm). See Fig. 4 . If spring is not as specified, sit on rear of vehicle then slowly get off. This will stabilize suspension deflection. Loosen eye bracket bolts. Adjust spring length by moving bracket. Tighten bracket bolts to 13-15 ft. lbs. (17-21 N.m). See Fig. 5 . NOTE: All fluids should be at specified levels (fuel tank full) and spare tire, jack, hand tools and floor mats should be in their stowed positions.
Thursday, July 23rd, 2009 AT 2:28 PM