Pressure-hold Test

This test activates selected wheel circuit valves in the modulator valve by placing valve in pressure-hold position. Valve action can be verified by checking appropriate wheel for braking action. The TECH 1 will indicate whether valve operated correctly. To perform pressure hold test, raise and support vehicle. Spin wheel freely. Use TECH 1 to command the PRESSURE HOLD mode. Have assistant apply brakes. Try to spin the wheel being tested. Wheel should spin, even with brakes applied, due to the hold command.