You just do this to see if a signal is received by the ABS unit. This is not a signal
quality check.
Step 3: Testing the hydraulic allocations
Have an assistant apply the brake pedal and maintain the brake pressure so all
four wheels of the jacked up vehicle are locked. Therefore, a brake pressure of 15
to 20 bar is sufficient. Unlock each wheel successively by clicking on “Release
Brake”. The selected wheel should run free now.
Notice
Certain vehicles require a high torque input at the wheel to
overcome the effect of residual brake pressure and resulting
torque.
Step 4: Testing the electrical pump motor
If you click the "Pump" button, the pump motor should run for 10 seconds or till
you click the button again.
Programming and Diagnosis Software | 9
Bosch Motorsport ABS M4 Manual 31 / 54
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