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Solenoid Valve Pressure Release Test

  1. This test activates selected hydraulic wheel circuit valve, placing it in pressure reduce position. When in pressure reduce position, valve will allow hydraulic pressure to be returned to master cylinder. Perform test as follows.
  2. Raise vehicle on frame contact hoist so wheels to be tested are off ground. Turn ignition on. Using Tech 1, select F4: SPECIAL TESTS and then F0: SOLENOID TESTS. Select solenoid to be tested. Select RELEASE PRESSURE mode.
  3. Have assistant apply brakes. Try to spin wheel being tested. While in RELEASE PRESSURE mode, wheel should spin even with brakes applied. Repeat test if necessary to verify proper operation. Perform SOLENOID VALVE PRESSURE HOLD TEST if test has not been performed.
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