Prius L4-1.8L (2ZR-FXE) Hybrid (2010)
4. Install the No.1 Anti-squeal shims. Install the No.2 Anti-squeal shims.
5. Using the Variable Pin Wrench (SST 09960-10010) slowly rotate the caliper piston until the piston groove is positioned as shown in the illustration.
CAUTION
Do NOT twist the brake hoses on the rear disc brake caliper assemblies.