Isolation Mode (Pressure Maintain)

Isolation Mode (pressure Maintain):

The Electronic Brake Control Module (EBCM) is armed when the driver applies the brakes and sends a signal to the module to prepare for a possible antilock stop. Isolation will occur when the driver applies excessive braking for the given road conditions, causing the wheel(s) to decelerate at a rate greater than the vehicle's capability. If the information from the wheel speed sensors indicates excessive wheel deceleration (imminent lockup), the first step in the antilock sequence is to isolate the brake pressure being applied by the driver.

The EBCM sends a voltage to the coil to energize and close the isolation valve by pulling down on the armature with a magnetic force. This will prevent any additional brake pressure applied by the driver from reaching the wheel. Though each channel of this 3 channel system can operate independently, once any front channel (brake) sees excessive deceleration, both front isolation valves are energized and closed. Thus, with the isolation valves closed, further unnecessary increases in brake pressure will be prohibited.