B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Hydraulic Control Assembly - Antilock Brakes: Testing and Inspection
Check Fuse
Check the fuse. If a fuse is burnt, replace it.
Check Isolation Valve Solenoid
1. Disconnect the hydraulic unit connector.
2. Measure the resistance between terminals 1 and 3 at the hydraulic unit.
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Resistance: approx. 3-6 ohms.
3. If not as specified, replace the hydraulic unit.
Check Isolation Valve Orifice
1. Disconnect the RABS control unit.
2. Raise the vehicle on a hoist far enough to allow the wheels to spin freely.
3. Start the vehicle, place in gear and allow wheels to spin at idle for at least 30 seconds.
4. Apply the brake pedal with normal force.
5. If the rear wheels react uncharacteristically slow or continue to spin, then replace the hydraulic unit.
Check Dump Valve Solenoid
