Abs Repair Instructions
ABS disturbances do not affect the brake system and the booster. The brake system remains functional without the ABS. The braking behavior will be different though. After the ABS indicator lamp comes on, the rear wheels could block too early while braking.
WARNING:
- The anti-lock braking system (ABS) is generally maintenance-free.
- Testing, assembly, and repair work may only be performed by qualified personnel.
- By not observing the points described in the repair manual, the system can be damaged and vehicle safety could be compromised.
The brake system is divided diagonally (two circuits). The brake booster is pneumatically controlled by the vacuum brake booster.
Malfunction sources are reduced by direct connection of components named. The components are replaced instead of repaired.
- Before performing repair work on the anti-lock brake system, determine the cause of the malfunction using On-Board Diagnostics (OBD).
- When installing a new hydraulic control unit, the coding must be checked using the Vehicle Diagnostic Tester.
- Turn off the ignition and disconnect the battery ground cable.
- When working with brake fluid, observe relevant safety precautions and notes, refer to BRAKE FLUID GENERAL INFORMATION .
- Bleed the brake system using the Brake Charger/Bleeder Unit VAS5234 for all work that requires opening the hydraulic system. High and low pressure testing should also be performed on the brake system, refer to CHECKING FOR LEAKS .
- During the final road test, ensure that a ABS-controlled brake test is performed at least once (pulsation must be felt at the brake pedal), using the Vehicle Diagnostic Tester.