General Notes

General notes on anti-lock braking system (ABS)

For ABS Mark 25, the following version is installed in the vehicle:
^ ABS/EDL/ASR with electronic stabilization program (ABS/EDL/ASR/ESP)

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

ABS system malfunctions influence the brake system including boost assist. Changes in braking behavior should be checked. When the ABS warning lamp is lit up, the wheels may lock 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 axle.





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

New control modules via the replacement parts service are not coded. Modules must be coded following installation.

Code control module using: VAS 5051 via "Guided fault finding" function.





ABS layout in left-hand drive vehicle.