1. Measure the inside diameter of the parking brake drum with inside vernier calipers.

   Parking brake drum inside diameter:
   | Standard: | 169.9−170.0 mm (6.689−6.693 in.)
   | Service limit: | 171.0 mm (6.732 in.)

1. If the inside diameter of the parking brake drum is more than service limit, replace the rear brake disc/drum.

1. Check the parking brake drum for scoring, grooves, and cracks.