Checking the brake pedal travel (Opel Insignia A)

1. With the ignition off and the brake system cooled, press the brake pedal 3-5 times until the pedal becomes hard, to use up the vacuum reserve in the vacuum booster.

2. Install a device for measuring the force applied to the brake pedal.

3. Measure and record the distance (1) from the brake pedal to the steering wheel rim.



4. Apply a force of 450 N to the brake pedal, using the measuring device installed on the pedal as a guide.

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5. Without releasing the pressure on the pedal, measure and record the distance (2) from the brake pedal to the steering wheel rim.

6. Release the pedal and repeat steps 4 and 5 to obtain a repeat value, then proceed to the next step.

7. Calculate the average value of two measurements obtained while pressing the brake pedal.

8. Subtract the measurement value (1) from the average value (2) to obtain the brake pedal stroke. Maximum piston stroke measured with the engine off, the brake system cooled down and the vacuum booster discharged: 48-58 mm.