Audi Q7: General Information

  Note

• On this vehicle the brake system is divided by axle.
• Right and left front axle
• Right and left rear axle

Anti-Lock Braking System (ABS) Repair Information

  Note

ABS malfunctions do not affect the brake system and the booster. The conventional brake system remains operative even without ABS. A change in braking behavior should be checked. When the ABS indicator 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 manual, the system can be damaged and vehicle safety could be compromised.
• Before performing repair work on the ABS system, determine the cause of the damage using OBD.
• Disconnect the battery ground cable when the ignition is switched off.
• When handling brake fluid, observe the relevant safety precautions and notes. Refer to → Chapter "Brake Fluid General Information".
• 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).

Component Location Overview

Component Location Overview - ABS/ESP

1 - Front Speed Sensor

• Left Front ABS Wheel Speed Sensor -G47-
• Right Front ABS Wheel Speed Sensor -G45-

• Overview. Refer to → Chapter "Overview - Front Axle Speed Sensor".

2 - Hydraulic Control Unit

• With

• ABS Control Module -J104-
• ABS Hydraulic Unit -N55-

• The control module and the hydraulic unit can be separated
• Overview. Refer to → Chapter "Overview - Control Module and Hydraulic Unit".

3 - Steering Angle Sensor -G85-

• Integrated in the Steering Column Switch Module
• Cannot be replaced separately
• If faulty replace the steering gear. Refer to →Electrical Equipment; Rep. Gr.94.

4 - Vacuum Sensor -G608-

5 - Switch Module in Instrument Panel, Center -EX22-

• With

• ASR/ESP Button -E256-
• Hill Descent Control Button -E618- (equipment level)

• Removing and installing. Refer to → Electrical Equipment; Rep. Gr.96; Controls; Component Location Overview - Controls in Center Console.

6 - Electromechanical Parking Brake Button -E538-

• Electromechanical Parking Brake Button -E538-
• -AUTO HOLD- Button -E540- (equipment level)

• Removing and installing. Refer to → Electrical Equipment; Rep. Gr.96; Controls; Electromechanical Parking Brake Button E538/-AUTO HOLD- ButtonE540, Removing and Installing.

7 - Roof Rack Recognition Sensor -G625-

• Component location: in the roof railing

8 - Brake Pad Wear Sensor

• Left Front Brake Pad Wear Sensor -G34-
• Right Front Brake Pad Wear Sensor -G35-
• Left Rear Brake Pad Wear Sensor -G36-
• Right Rear Brake Pad Wear Sensor -G37-

• Actually in the inner brake pad.
• Overview. Refer to → Chapter "Overview - Front Brakes", and → Chapter "Overview - Rear Brakes".

9 - Rear Speed Sensor

• Right Rear ABS Wheel Speed Sensor -G44-
• Left Rear ABS Wheel Speed Sensor -G46-

• Overview. Refer to → Chapter "Overview - Rear Axle Speed Sensor".

10 - Instrument Cluster with Instrument Cluster Control Module -J285-

• With the following integrated indicator lamps:

• ABS Indicator Lamp -K47-
• Brake System Indicator Lamp -K118-
• Parking Brake Indicator Lamp -K139-

• The indicator lamps cannot be replaced separately
• Replace the instrument cluster if faulty. Refer to → Electrical Equipment; Rep. Gr.90; Instrument Cluster; Overview - Instrument Cluster.

11 - Brake Lamp Switch -F-

• Component location: on the brake master cylinder
• Overview. Refer to → Chapter "Overview - Brake Booster/Brake Master Cylinder".

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