Anti-lock Brake System

Anti-lock Brake System

For Anti-lock Brake System (ABS) Mark 25, only the following version is installed in this vehicle:

• ABS/Electronic Differential Lock (EDL)/Anti-Slip Regulation (ASR) with Electronic Stabilization Program (ESP)

The ABS is divided diagonally (into two circuits). The vacuum brake servo unit boosts the brakes pneumatically.

Malfunctions to the ABS influence the brake system and servo assist. A change in braking behavior should be checked. When the ABS warning lamp is lit up, the rear wheels may lock prematurely during braking!

Vehicles with ABS Mark 25 do not have a mechanical brake pressure regulator. A specially coordinated software program in the control module determines brake pressure allocation at the rear wheels.

The ABS control module - 1 - and hydraulic unit - 2 - comprise a single unit. Separation can only be performed when removed from the vehicle. The hydraulic pump - 3 - must not be separated from the hydraulic unit.





New control modules, as a replacement part are not coded. They must be coded following the installation. Refer to code the control module using VAS 5051 in Guided Fault Finding.

ABS layout in left hand drive vehicles.