C0140high severityChassis
Electronic Brake Force Distribution Malfunction
on 2008 Audi RS4 4.2L V8 · AWD
What this code means
The EBD system that proportions brake force between front and rear has detected a fault.
Symptoms
- ABS light on
- Brake warning light on
- Rear wheels may lock under hard braking
- Vehicle pulls to one side during braking
Common causes
- ABS sensor mismatch between front and rear
- ABS modulator valve fault
- Uneven brake pad wear front to rear
- Brake pressure imbalance
Diagnostic steps
- Compare all four wheel speed sensor readings during braking
- Check brake pad wear at all four corners
- Inspect ABS modulator valve codes
- Test brake pressure distribution
- Verify tire sizes match
Repair notes
{"Diagnose underlying ABS or mechanical brake issue. EBD relies on ABS components to function."}
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic