22 · Diagnostics

Excessive brake pedal free play

Fault diagnosisExcessive brake pedal free play

EXCESSIVE BRAKE PEDAL FREE PLAY

When the brake pedal is pressed, the travel is longer than the normal operating travel

1	CHECK FOR FLUID LEAKS	All OK	Problems met	Operation
		Results of the tests
	Visually check the braking system for leaks	Continue to Step 2	Fluid leak detected	Retighten the connectors (see Assembly 3330A)
	Visually check the braking system for leaks	Continue to Step 2	Component defective	Replace faulty component
2	CHECK BRAKE PUMP FOR FLUID LEAKS	All OK	Problems met	Operation
	Disconnect the non-return valve connector from the servo unit and insert a tube brush into the bottom of the servo unit chamber. Check that there is no fluid in the chamber	Continue to Step 3	Fluid present in the servo unit chamber	Replace the servo unit Op. 3330D10
3	CHECK FOR AIR IN THE SYSTEM	All OK	Problems met	Operation
	Check for presence of air in the braking system	Continue to Step 4	Presence of air in the system	Bleed the system Op. 3330A18
4	CHECK EFFICIENCY OF REAR BRAKE PLAY TAKE-UP DEVICE	All OK	Problems met	Operation
	Check the efficiency of the rear brake play take-up device.	Continue to Step 5	Faulty brake play take-up device	Replace the cylinders Op. 3320B20
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

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