Abs Repair Instructions
ABS malfunctions do not affect the brake system and the booster. Conventional brake system stays operative even without ABS. A change in braking behavior should be checked. When the ABS warning lamp comes on the rear wheels can lock-up early when braking!
WARNING:
- The 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 information, the system can be damaged and vehicle safety could be compromised.
Vehicles with High Voltage System
WARNING:
Pay attention to the general warnings for working on the high-voltage system. Refer to SAFETY PRECAUTIONS WHEN WORKING NEAR HIGH-VOLTAGE COMPONENTS .
All Vehicles
- 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. Refer to Vehicle Diagnostic Tester.
- Turn off the ignition and disconnect the battery Ground (GND) cable.
- When working with brake fluid, observe the relevant safety precautions and notes.
- Bleed the brake system with 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.
- 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). Refer to the appropriate Service Information.