Antilock Brake System With Traction Control: Notes

Fig 1: Identifying Hydraulic Control Unit (HCU) & Hydraulic Lines

Courtesy of DAIMLERCHRYSLER CORP.

This vehicle uses the Continental Teves MK25e electronic brake control system. The system includes ABS (Anti-lock Brake System), EVBP (Electronic Variable Brake Proportioning), TCS (Traction Control System), BAS (Brake Assist System), ERM (Electronic Roll Mitigation) and ESP (Electronic Stability Program). All six systems work together to enhance vehicle stability and control in various driving conditions and are commonly referred to as ESP. ESP is standard.

The electronic brake control system uses the following components to operate:

• Integrated Control Unit (ICU) - The ICU is a combination of the Electronic Brake Controller (EBC) and the Hydraulic Control Unit (HCU) (4)
• Wheel Speed Sensors (WSS) - Four sensors (one at each wheel)
• Dynamics Sensor - The Dynamics Sensor includes a yaw rate sensor, (The Dynamics Sensor is located under the center console near the center of the vehicle).
• lateral accelerometer and, on 4x4 vehicles with a low range transfer case (245 T-Case), a longitudinal accelerometer.
• Steering Angle Sensor (SAS) - The SAS is part of the clock spring assembly in the steering column.
• Brake Pressure Sensor - The brake pressure sensor is located in the HCU and is not serviceable separate from the HCU.