Antilock Brake System (ABS)

ANTILOCK BRAKE SYSTEM






NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

This vehicle uses an antilock brake system designated MK25e. Some vehicles are equipped with MK25e antilock brakes only. Other vehicles are equipped with MK25e antilock brakes including Electronic Stability Control (ESC) and All-Speed Traction Control.

This four-channel antilock brake system uses components of the base brake system, but also features the following components:

- Integrated Control Unit (ICU) - Hydraulic Control Unit (HCU) (2) and Antilock Brake Module (ABM) (1)
- Wheel Speed Sensors (WSS) - Four sensors (one sensor at each wheel making it a four-channel system)

If equipped with ESC, there are additional components. For additional information, refer to the ESC Description. Description and Operation

The MK25e ICU is made up of the Hydraulic Control Unit (HCU) and the Antilock Brake Module (ABM). For additional information on these components, Hydraulic Control unit (HCU) - Description Anti-Lock Brake System Module - Description.

ABS

The purpose of the antilock brake system (ABS) is to prevent wheel lockup under braking conditions on virtually any type of road surface. Antilock braking is desirable because a vehicle that is stopped without locking the wheels retains directional stability and some steering capability. This allows the driver to retain greater control of the vehicle during braking.

All vehicles equipped with ABS use Electronic Variable Brake Proportioning (EVBP) to balance front-to-rear braking when the brakes are applied in the partial braking range. For more information on electronic brake distribution, Description and Operation.

ELECTRONIC STABILITY CONTROL

For information on the Electronic Stability Control, Description and Operation.

TRACTION CONTROL

For information on the All-Speed Traction Control, Description and Operation.