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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 115 (Antilock Brake System, Traction Control System & Stability Control System) >> Description and Operation >> ABS Description and Operation (Over 8600 GVW) >> Antilock Brake System (ABS) Operation >> Pressure Hold

Pressure Hold

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The EBCM closes the isolation valve and keeps the dump valve closed in order to isolate the slipping wheel when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.