J 21177-A Drum-to-Brake Shoe Clearance Gage

Important: 

1. Apply and fully release the parking brake three times.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Verify that the park brake pedal releases completely.
4. Remove the rear tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.



5. Remove the rear brake rotors. Refer to Rear Brake Rotor Replacement in Disc Brakes.



6. Set the J 21177-A inside of the park brake drum portion of the brake rotor (1) at the widest point.
7. Tighten the set screw on the tool to ensure the proper measurement when removing the tool from the drum.



8. Position the J 21177-A over the park brake shoe (1) at the widest point.
9. Turn the adjuster on the actuator until the park brake shoe just contacts the J 21177-A .
10. Repeat steps 6 through 9 for the opposite side.
11. Install the rear brake rotors. Refer to Rear Brake Rotor Replacement in Disc Brakes.
12. Install the rear tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
13. Set and release the park brake lever three times.

Important: If the rear wheels rotate during the following test, readjust the park brake shoe.

14. Apply the park brake. Inspect the rotation of the rear wheels:

•	The wheels should not rotate forward.

•	The wheels should not drag or rotate rearward.

15. Release the park brake. Verify that the rear wheels rotate freely.
16. Lower the vehicle.