One problem related to brakes failed has been reported for the 2008 Subaru Impreza Wrx. The most recently reported issues are listed below.
Brake/clutch bracket weld failure. Brake/clutch pedal assembly is lose. 3 of the 5 spotwelds holding the brake/clutch assembly have failed. This causes the brakes to feel mushy and the clutch difficult to depress and difficult to engage and disengage the clutch. The brakes may fail if the other two welds brake.