22 · Diagnostics

Brakes noisy

Fault diagnosisBrakes noisy

BRAKES NOISY

During braking, a whistle or screech may be heard from the area of the wheels. Vibration may also be detected in the interior compartment.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Steer to the right or the left and check whether the noise increases.	Noise does not change: Continue to Step 1	The noise varies during steering	See table S45
1	CHECK FRICTION SURFACES	All OK	Problems met	Operation
	Check condition of front pad friction surfaces condition of rear pad friction surfaces	Continue to Step 3	Friction surfaces vitrified or with traces of grease, oil or water	Clean, check and eliminate the causes of the fault
			Front brake pads damaged or wrong type	Replace pads Op. 3310A60
			Rear shoes damaged or wrong type	Replace the shoes Op. 3320B10
2	CHECK FRONT DISCS AND CALIPERS	All OK	Problems met	Operation
	Check condition of the front brake discs Check the condition of the brake caliper pistons	Continue to Step 4	Front discs worn or damaged	Grind the discs Op. 3310A54, or replace if necessary
		Continue to Step 4	Front caliper pistons worn or seized	Replace brake calipers Op. 3310A30
3	CHECK REAR DRUMS	All OK	Problems met	Operation
	Check the condition of the rear brake drums Drum ovalisation, even if slight, causes increased noise	Continue to Step 5	Rear drums worn or damaged	Replace the drums Op. 3320B30
4	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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