ABS Description and Operation: Notes

This vehicle is equipped with the Continental Teves MK-70 antilock braking system.

The vehicle is equipped with the following braking systems:

• Antilock Brake System (ABS).
• Engine Traction System (ETS) (w/NW7)

The following components are involved in the operation of the above system.

• Electronic brake control module (EBCM)-The EBCM controls the system functions and detects failures.

  The EBCM contains the following components:

• Solenoids-The solenoids are commanded by the EBCM to operate the appropriate valves in the brake pressure modulator valve.

  The EBCM contains the following components:

• Brake pressure modulator valve (BPMV)-The BPMV uses a 4-circuit configuration to direct fluid to the left front, right front, left rear, and right rear wheels independently.

  The BPMV contains the following components:

  • Pump motor
  • Four isolation valve for each hydraulic circuit
  • Four dump valve for each hydraulic circuit
• Wheel speed sensors (WSS)-As the wheels spin, a toothed ring located at each wheel hub interrupts a magnetic field in the wheel speed sensors. This causes the wheel speed sensors to generate an AC signal. The EBCM uses this AC signal to calculate the wheel speed. Any imperfections in the toothed ring, such as a missing or damaged tooth, can cause an inaccurate WSS signal.