A reading from the Book of Mopar: 05 - Brakes / Brakes, Base / Parking Brake / Standard Procedure plus SHOES, Parking Brake / Adjustments...
NOTE: The parking brake shoes used in the drum-in-hat park brake system do not automatically adjust to compensate for brake shoe lining wear. Therefore, it is necessary to manually adjust the parking brake shoes.
1. Verify the parking brake lever is in the released (down) position.
2. Raise and support the vehicle.
3. Remove the wheel mounting bolts, then the tire and wheel assembly.
4. Install a couple wheel mounting bolts to hold the brake rotor in place while adjustment of the brake shoes is made. NOTE: To find the adjuster wheel with the brake rotor on, position the hole in the front of the rotor drum as follows: •Left side – 7 o'clock. •Right side – 5 o'clock.
NOTE: When adjusting the parking brake shoes with the drum-in hat rotor installed, rotating the adjuster wheel upward will loosen the adjustment. Rotating the adjuster wheel downward will tighten the adjustment.
5. Utilizing a hole in the front of the rotor, make a fine adjustment of the shoes.
6. Lower the vehicle far enough to access the interior of the vehicle.
7. Reach inside the vehicle and cycle (fully apply and release) the park brakes.
8. With the parking brake lever in the fully applied (up) position, attempt to hand rotate each rear brake rotor to ensure that the parking brake shoes are working properly.
9. With the parking brake lever in the released (down) position, hand rotate each rear brake rotor to ensure that the parking brake shoes are not dragging.
STANDARD PROCEDURE - PARKING BRAKE ADJUSTMENT
3. Loosen the jam nut (2) and lightly tighten the equalizer nut (1).
4. Using an assistant in the vehicle, apply and release the hand brake lever 5 times to fully seat the parking brake components (1).
5. To measure the force on the hand brake lever, the force gauge must be placed 40 mm (1.57 in) from the tip of the grip, perpendicular to the lever handle (2).
6. Using the force gauge, adjust the rear cable tension by rotating the equalizer nut (1) to achieve 80 N (18 lbf) with the hand brake lever at the fifth click.
7. Re-measure the input force at the hand brake lever at the fifth click to ensure it is still at 80 ± 5N (18 lbf ± 18 ozf ). 8. Holding the equalizer nut (1), tighten the jam nut (2) to 15 Nm (11 lb-ft).
9. Actuate the parking brake to ensure that it is functioning properly.
10. Lower the vehicle.
What they don't show is the return spring is lightweight and easily corrodes, while adjusting take a long look at that...
Anyhow, been a while since the PB adjust routine has been mentioned, keep your shorts on!