Bosch ABS M4 User Manual page 31

Programming and Diagnosis Software | 9
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.
Certain vehicles require a high torque input at the wheel to
Notice
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.
Bosch Motorsport ABS M4 Manual 31 / 54