Subaru IMPREZA 2002 Service Manual page 428

GENERAL DIAGNOSTICS
BRAKE
Trouble and possible cause Corrective action
BR-58
7.
Brake
noise
(3)
(click sound)
I
In the case of the disc brake:
(1) Excessively worn pad or the support
In
the case of the drum brake:
(1) Excessively worn shoe ridge
(2) Lack of oil on the shoe ridge surface and
anchor
I
Replace the pad or the support.
Replace the back plate.
Add more grease.