BMW ABS Sensors Calibration

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Calibrate axial acceleration sensor

Calibrate lateral acceleration sensor

Calibrate pressure sensor

1) Calibrate Axial Acceleration Sensor

What it measures

• Longitudinal acceleration (forward/backward)
• Braking deceleration
• Traction control behavior
• Vehicle stability calculations

Used for

• ABS regulation
• Traction control during acceleration
• Brake force distribution
• Detection of engine braking

Purpose of calibration

* Establishes the correct zero (baseline) longitudinal acceleration when the vehicle is stationary.

When calibration is required

• Replacement of the control unit
• Replacement of the axial acceleration sensor
• Battery voltage interruptions
• Suspension modifications or geometry changes
• Sensor angle or reference may shift

If calibration is not performed

• Incorrect ABS/DSC intervention
• Inconsistent traction control behavior
• Possible DSC/ABS warning lights

2) Calibrate Lateral Acceleration Sensor

What it measures

• Lateral (side) forces while cornering
• Vehicle slip and stability behavior

Used for

• Detection of oversteer and understeer
• Selective brake intervention
• Stability control algorithms

Purpose of calibration

* Defines the zero lateral acceleration reference when the vehicle is on a level surface.

When calibration is required

• Replacement of the lateral acceleration sensor
• Replacement of the control unit
• Body or chassis repairs after impact
• Suspension changes
• Possible change of sensor orientation

If calibration is not performed

• Early or delayed DSC intervention
• False DSC activation
• Reduced stability in dynamic maneuvers

3) Calibrate Pressure Sensor

What it measures

• Hydraulic brake pressure inside the DSC unit
• Actual brake force applied by the driver

Used for

• ABS pressure modulation
• Traction control braking
• Emergency braking functions
• Brake force distribution

Purpose of calibration

* Sets the zero-pressure reference when no brake force is applied.

When calibration is required

• Replacement of the control unit
• Work on brake hydraulics
• Pressure sensor fault codes
• Incorrect or unstable pressure readings

If calibration is not performed

• Inaccurate ABS modulation
• Incorrect or delayed DSC intervention
• Warning lights and persistent error codes

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